Thank you all for your replies...

@Reindl thanks for pointing that out. Now, reading again the output of free -m and knowing that tokudb
will try to get much as 50% of the server's memory, I will surely need to tweak some values since free + cached memory
doesn't meet the need

[root@db ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          7840       7793         47          0         23       3572
-/+ buffers/cache:       4197       3642
Swap:         2047       1494        553

I will work on tweaking the tokudb_cache_size and the innodb_buffer_pool_size parameters, I will let you know from there.

Thank you

On Tue, Mar 3, 2015 at 6:47 PM, Reindl Harald <h.reindl@thelounge.net> wrote:

Am 03.03.2015 um 22:26 schrieb Gabriel Sosa:
using systemtap I got

[Tue Mar  3 18:48:46 2015] SIGKILL was sent to ps (pid:9763) by
processes uid:0
[Tue Mar  3 18:49:46 2015] SIGKILL was sent to ps (pid:9824) by
processes uid:0
 *[Tue Mar  3 18:50:44 2015] SIGKILL was sent to mysqld (pid:7597) by
mysqld uid:498*
[Tue Mar  3 18:50:46 2015] SIGKILL was sent to ps (pid:9890) by
processes uid:0
[Tue Mar  3 18:51:46 2015] SIGKILL was sent to ps (pid:9997) by
processes uid:0
[Tue Mar  3 18:52:35 2015] SIGKILL was sent to cdm (pid:10045) by cdm uid:0


I saw this several times but I wasn't able to find (in this case) which
process has the PID 498. @jocelyn, you are right...to tweaks at all for
 tokudb (my bad here), although I wasn't expecting such /naive/ approach,
I mean, I could have not enable the tokudb plugin and all other tables
using the other engines would work just fine (maybe just slow though)

free -m returns about 47M free...which isn't much...

you need to learn read the output

it don't matter how much is free, what matters is if the allocated memory is used, shared, buffers or even cache - cache don't matter because it is re-used if a application requests memory

until that happens a sane OS is using *100 %* of the available memory for caching - that below don't mean there are only 577 MB free, i can with no issue start a application requesting 4 GB ram because the 11086 MB cache can be re-used at every moment in time

[root@srv-rhsoft:~]$ free -m
             total       used       free     shared    buffers     cached
Mem:         15923      15345        577        239       1020      11086
-/+ buffers/cache:       3238      12684
Swap:         3025          6       3018


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--
Gabriel Sosa
Sometimes the questions are complicated and the answers are simple. -- Dr. Seuss