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Re: Installing jemalloc on build VMs



In previous versions, we shipped jemalloc as a shared library and patched mysqld_safe to inject it into LD_PRELOAD. Some users ran mysqld directly and therefore didn't have jemalloc. To protect users from this, we opted to statically link jemalloc into mysqld instead. To my knowledge that's the only reason it's a build dependency. 

On Fri, Apr 26, 2013 at 3:26 AM, Vladislav Vaintroub
<wlad@xxxxxxxxxxxxxxxx> wrote:

> Mark, your links do not tell me why build dependency is good.
> Yes, yes, malloc() replacement du jour is nice,  is fast, will bring peace
> to Middle East.. but it is extremely easy to setup on Linux. So, my question
> depends why would anyone want to have *build* dependency, remains
> unanswered.
> From: MARK CALLAGHAN [mailto:mdcallag@xxxxxxxxx] 
> Sent: Freitag, 26. April 2013 08:16
> To: Vladislav Vaintroub
> Cc: Kristian Nielsen; Daniel Bartholomew;
> maria-developers@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Maria-developers] Installing jemalloc on build VMs
> Educated snark is much better than uneducated snark. Why don't you take the
> time to understand why TokuDB benefits from jemalloc before suggesting they
> fix their code. mysqld has always been faster for me with tcmalloc &
> jemalloc versus glibc malloc. I don't recall much support from everyone at
> official MySQL when I was reporting those problem. Why didn't you fix mysqld
> back then so I didn't have to waste time on that?
> http://mysqlha.blogspot.com/2009/01/double-sysbench-throughput-with_18.html
> http://mysqlha.blogspot.com/2008/12/make-mysql-faster-in-one-hour_14.html
> http://mysqlha.blogspot.com/2009/01/innodb-is-faster-tcmalloc-is-nice.html
> On Thu, Apr 25, 2013 at 9:47 AM, Vladislav Vaintroub <wlad@xxxxxxxxxxxxxxxx>
> wrote:
>> -----Original Message-----
>> From: Maria-developers [mailto:maria-developers-
>> bounces+wlad=montyprogram.com@xxxxxxxxxxxxxxxxxxx] On Behalf Of
>> Kristian Nielsen
>> Sent: Donnerstag, 25. April 2013 18:30
>> To: Daniel Bartholomew
>> Cc: maria-developers@xxxxxxxxxxxxxxxxxxx
>> Subject: Re: [Maria-developers] Installing jemalloc on build VMs
>> It is said that tokutek "requires" jemalloc - maybe it would be better to
> fix
>> tokutek to work with standard libraries?
> I wanted to say the same. I do not understand quite how it is possible to
> rely on malloc replacement library - it is a replacement, it is typically
> handled at runtime (using LD_PRELOAD environment variable). Perhaps someone
> familiar with the subject can enlighten us on it.
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> -- 
> Mark Callaghan
> mdcallag@xxxxxxxxx 

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