- developers - lists.mariadb.org

[Maria-developers] Updated (by Igor): Partitioned Key Cache for MyISAM (85)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Partitioned Key Cache for MyISAM CREATION DATE..: Sun, 14 Feb 2010, 00:10 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 85 (http://askmonty.org/worklog/?tid=85) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:34)=-=- High Level Description modified. --- /tmp/wklog.85.old.22371 2010-03-16 19:34:33.000000000 +0000 +++ /tmp/wklog.85.new.22371 2010-03-16 19:34:33.000000000 +0000 @@ -15,4 +15,5 @@ the chances for threads not compete for the same key cache lock better. The idea and the original of the partitioned key cache was provided by one of -our external contributers. +our external contributers (see the attached file segmented_keycache_v2.diff with +the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:15)=-=- Category updated. --- /tmp/wklog.85.old.9810 2010-02-13 22:15:43.000000000 +0000 +++ /tmp/wklog.85.new.9810 2010-02-13 22:15:43.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:15)=-=- Version updated. --- /tmp/wklog.85.old.9810 2010-02-13 22:15:43.000000000 +0000 +++ /tmp/wklog.85.new.9810 2010-02-13 22:15:43.000000000 +0000 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 -=-=(Igor - Sun, 14 Feb 2010, 00:12)=-=- New attachment: 'segmented_keycache_v2.diff' DESCRIPTION: A partitioned key cache is a collection of structures for regular MyiSAM key caches called key cache partitions. Any page from a file can be placed into a buffer of only one partition. The number of the partition is calculated from the file number and the position of the page in the file, and it's always the same for the page. The function that maps pages into partitions takes care of even distribution of pages among partitions. Partition key cache mitigate one of the major problem of simple key cache: thread contention for key cache lock (mutex). Every call of a key cache interface function must acquire this lock. So threads compete for this lock even in the case when they have acquired shared locks for the file and pages they want read from are in the key cache buffers. When working with a partitioned key cache any key cache interface function that needs only one page has to acquire the key cache lock only for the partition the page is ascribed to. This makes the chances for threads not compete for the same key cache lock better. The idea and the original of the partitioned key cache was provided by one of our external contributers (see the attached file segmented_keycache_v2.diff with the original patch from the contributor). ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Unused (86)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Unused CREATION DATE..: Sun, 14 Feb 2010, 00:17 SUPERVISOR.....: Monty IMPLEMENTOR....: Igor COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 86 (http://askmonty.org/worklog/?tid=86) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:30)=-=- Title modified. --- /tmp/wklog.86.old.22309 2010-03-16 19:30:04.000000000 +0000 +++ /tmp/wklog.86.new.22309 2010-03-16 19:30:04.000000000 +0000 @@ -1 +1 @@ -Partitioned Key Cache for MyISAM +Unused -=-=(Igor - Tue, 16 Mar 2010, 19:29)=-=- High Level Description modified. --- /tmp/wklog.86.old.22292 2010-03-16 19:29:37.000000000 +0000 +++ /tmp/wklog.86.new.22292 2010-03-16 19:29:37.000000000 +0000 @@ -1,19 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers (see the attached file segmented_keycache_v2.diff with -the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Privacy level updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -y +n -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Category updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:18)=-=- Version updated. --- /tmp/wklog.86.old.10044 2010-02-14 00:18:31.000000000 +0200 +++ /tmp/wklog.86.new.10044 2010-02-14 00:18:31.000000000 +0200 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Unused (86)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Unused CREATION DATE..: Sun, 14 Feb 2010, 00:17 SUPERVISOR.....: Monty IMPLEMENTOR....: Igor COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 86 (http://askmonty.org/worklog/?tid=86) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:30)=-=- Title modified. --- /tmp/wklog.86.old.22309 2010-03-16 19:30:04.000000000 +0000 +++ /tmp/wklog.86.new.22309 2010-03-16 19:30:04.000000000 +0000 @@ -1 +1 @@ -Partitioned Key Cache for MyISAM +Unused -=-=(Igor - Tue, 16 Mar 2010, 19:29)=-=- High Level Description modified. --- /tmp/wklog.86.old.22292 2010-03-16 19:29:37.000000000 +0000 +++ /tmp/wklog.86.new.22292 2010-03-16 19:29:37.000000000 +0000 @@ -1,19 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers (see the attached file segmented_keycache_v2.diff with -the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Privacy level updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -y +n -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Category updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:18)=-=- Version updated. --- /tmp/wklog.86.old.10044 2010-02-14 00:18:31.000000000 +0200 +++ /tmp/wklog.86.new.10044 2010-02-14 00:18:31.000000000 +0200 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Unused (86)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Unused CREATION DATE..: Sun, 14 Feb 2010, 00:17 SUPERVISOR.....: Monty IMPLEMENTOR....: Igor COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 86 (http://askmonty.org/worklog/?tid=86) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:30)=-=- Title modified. --- /tmp/wklog.86.old.22309 2010-03-16 19:30:04.000000000 +0000 +++ /tmp/wklog.86.new.22309 2010-03-16 19:30:04.000000000 +0000 @@ -1 +1 @@ -Partitioned Key Cache for MyISAM +Unused -=-=(Igor - Tue, 16 Mar 2010, 19:29)=-=- High Level Description modified. --- /tmp/wklog.86.old.22292 2010-03-16 19:29:37.000000000 +0000 +++ /tmp/wklog.86.new.22292 2010-03-16 19:29:37.000000000 +0000 @@ -1,19 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers (see the attached file segmented_keycache_v2.diff with -the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Privacy level updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -y +n -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Category updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:18)=-=- Version updated. --- /tmp/wklog.86.old.10044 2010-02-14 00:18:31.000000000 +0200 +++ /tmp/wklog.86.new.10044 2010-02-14 00:18:31.000000000 +0200 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Partitioned Key Cache for MyISAM (86)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Partitioned Key Cache for MyISAM CREATION DATE..: Sun, 14 Feb 2010, 00:17 SUPERVISOR.....: Monty IMPLEMENTOR....: Igor COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 86 (http://askmonty.org/worklog/?tid=86) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:29)=-=- High Level Description modified. --- /tmp/wklog.86.old.22292 2010-03-16 19:29:37.000000000 +0000 +++ /tmp/wklog.86.new.22292 2010-03-16 19:29:37.000000000 +0000 @@ -1,19 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers (see the attached file segmented_keycache_v2.diff with -the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Privacy level updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -y +n -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Category updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:18)=-=- Version updated. --- /tmp/wklog.86.old.10044 2010-02-14 00:18:31.000000000 +0200 +++ /tmp/wklog.86.new.10044 2010-02-14 00:18:31.000000000 +0200 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Partitioned Key Cache for MyISAM (86)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Partitioned Key Cache for MyISAM CREATION DATE..: Sun, 14 Feb 2010, 00:17 SUPERVISOR.....: Monty IMPLEMENTOR....: Igor COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 86 (http://askmonty.org/worklog/?tid=86) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:29)=-=- High Level Description modified. --- /tmp/wklog.86.old.22292 2010-03-16 19:29:37.000000000 +0000 +++ /tmp/wklog.86.new.22292 2010-03-16 19:29:37.000000000 +0000 @@ -1,19 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers (see the attached file segmented_keycache_v2.diff with -the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Privacy level updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -y +n -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Category updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:18)=-=- Version updated. --- /tmp/wklog.86.old.10044 2010-02-14 00:18:31.000000000 +0200 +++ /tmp/wklog.86.new.10044 2010-02-14 00:18:31.000000000 +0200 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Partitioned Key Cache for MyISAM (86)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Partitioned Key Cache for MyISAM CREATION DATE..: Sun, 14 Feb 2010, 00:17 SUPERVISOR.....: Monty IMPLEMENTOR....: Igor COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-Sprint TASK ID........: 86 (http://askmonty.org/worklog/?tid=86) VERSION........: Server-5.2 STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: 80 (hours remain) ORIG. ESTIMATE.: 80 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:29)=-=- High Level Description modified. --- /tmp/wklog.86.old.22292 2010-03-16 19:29:37.000000000 +0000 +++ /tmp/wklog.86.new.22292 2010-03-16 19:29:37.000000000 +0000 @@ -1,19 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers (see the attached file segmented_keycache_v2.diff with -the original patch from the contributor). -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Privacy level updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -y +n -=-=(Igor - Sun, 14 Feb 2010, 00:19)=-=- Category updated. --- /tmp/wklog.86.old.10092 2010-02-13 22:19:03.000000000 +0000 +++ /tmp/wklog.86.new.10092 2010-02-13 22:19:03.000000000 +0000 @@ -1 +1 @@ -Server-BackLog +Server-Sprint -=-=(Igor - Sun, 14 Feb 2010, 00:18)=-=- Version updated. --- /tmp/wklog.86.old.10044 2010-02-14 00:18:31.000000000 +0200 +++ /tmp/wklog.86.new.10044 2010-02-14 00:18:31.000000000 +0200 @@ -1 +1 @@ -Benchmarks-3.0 +Server-5.2 DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Unused (84)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Unused CREATION DATE..: Sun, 14 Feb 2010, 00:09 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-BackLog TASK ID........: 84 (http://askmonty.org/worklog/?tid=84) VERSION........: Server-9.x STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: (hours remain) ORIG. ESTIMATE.: 0 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- Title modified. --- /tmp/wklog.84.old.22271 2010-03-16 19:28:50.000000000 +0000 +++ /tmp/wklog.84.new.22271 2010-03-16 19:28:50.000000000 +0000 @@ -1 +1 @@ -Partitioned Key Cache for MyISAM +Unused -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- Version updated. --- /tmp/wklog.84.old.22271 2010-03-16 19:28:50.000000000 +0000 +++ /tmp/wklog.84.new.22271 2010-03-16 19:28:50.000000000 +0000 @@ -1 +1 @@ -Benchmarks-3.0 +Server-9.x -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- High Level Description modified. --- /tmp/wklog.84.old.22253 2010-03-16 19:28:09.000000000 +0000 +++ /tmp/wklog.84.new.22253 2010-03-16 19:28:09.000000000 +0000 @@ -1,18 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers. DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Unused (84)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Unused CREATION DATE..: Sun, 14 Feb 2010, 00:09 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-BackLog TASK ID........: 84 (http://askmonty.org/worklog/?tid=84) VERSION........: Server-9.x STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: (hours remain) ORIG. ESTIMATE.: 0 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- Title modified. --- /tmp/wklog.84.old.22271 2010-03-16 19:28:50.000000000 +0000 +++ /tmp/wklog.84.new.22271 2010-03-16 19:28:50.000000000 +0000 @@ -1 +1 @@ -Partitioned Key Cache for MyISAM +Unused -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- Version updated. --- /tmp/wklog.84.old.22271 2010-03-16 19:28:50.000000000 +0000 +++ /tmp/wklog.84.new.22271 2010-03-16 19:28:50.000000000 +0000 @@ -1 +1 @@ -Benchmarks-3.0 +Server-9.x -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- High Level Description modified. --- /tmp/wklog.84.old.22253 2010-03-16 19:28:09.000000000 +0000 +++ /tmp/wklog.84.new.22253 2010-03-16 19:28:09.000000000 +0000 @@ -1,18 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers. DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

1 0

[Maria-developers] Updated (by Igor): Unused (84)
by worklog-noreply＠askmonty.org 16 Mar '10

16 Mar '10

----------------------------------------------------------------------- WORKLOG TASK -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- TASK...........: Unused CREATION DATE..: Sun, 14 Feb 2010, 00:09 SUPERVISOR.....: Monty IMPLEMENTOR....: COPIES TO......: Igor, Monty, Sergei CATEGORY.......: Server-BackLog TASK ID........: 84 (http://askmonty.org/worklog/?tid=84) VERSION........: Server-9.x STATUS.........: Assigned PRIORITY.......: 60 WORKED HOURS...: 0 ESTIMATE.......: (hours remain) ORIG. ESTIMATE.: 0 PROGRESS NOTES: -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- Title modified. --- /tmp/wklog.84.old.22271 2010-03-16 19:28:50.000000000 +0000 +++ /tmp/wklog.84.new.22271 2010-03-16 19:28:50.000000000 +0000 @@ -1 +1 @@ -Partitioned Key Cache for MyISAM +Unused -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- Version updated. --- /tmp/wklog.84.old.22271 2010-03-16 19:28:50.000000000 +0000 +++ /tmp/wklog.84.new.22271 2010-03-16 19:28:50.000000000 +0000 @@ -1 +1 @@ -Benchmarks-3.0 +Server-9.x -=-=(Igor - Tue, 16 Mar 2010, 19:28)=-=- High Level Description modified. --- /tmp/wklog.84.old.22253 2010-03-16 19:28:09.000000000 +0000 +++ /tmp/wklog.84.new.22253 2010-03-16 19:28:09.000000000 +0000 @@ -1,18 +1 @@ -A partitioned key cache is a collection of structures for regular MyiSAM key -caches called key cache partitions. Any page from a file can be placed into a -buffer of only one partition. The number of the partition is calculated from the -file number and the position of the page in the file, and it's always the same -for the page. The function that maps pages into partitions takes care of even -distribution of pages among partitions. -Partition key cache mitigate one of the major problem of simple key cache: -thread contention for key cache lock (mutex). Every call of a key cache -interface function must acquire this lock. So threads compete for this lock even -in the case when they have acquired shared locks for the file and pages they -want read from are in the key cache buffers. When working with a partitioned key -cache any key cache interface function that needs only one page has to acquire -the key cache lock only for the partition the page is ascribed to. This makes -the chances for threads not compete for the same key cache lock better. - -The idea and the original of the partitioned key cache was provided by one of -our external contributers. DESCRIPTION: ESTIMATED WORK TIME ESTIMATED COMPLETION DATE ----------------------------------------------------------------------- WorkLog (v3.5.9)

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