| From: | Aleksander Alekseev <a(dot)alekseev(at)postgrespro(dot)ru> |
|---|---|
| To: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Patch: fix lock contention for HASHHDR.mutex |
| Date: | 2016-01-27 11:45:42 |
| Message-ID: | 20160127144542.224c0741@fujitsu |
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| Thread: | |
| Lists: | pgsql-hackers |
> > This patch affects header files. By any chance didn't you forget to
> > run `make clean` after applying it? As we discussed above, when you
> > change .h files autotools doesn't rebuild dependent .c files:
> >
>
> Yes, actually i always compile using "make clean;make -j20; make
> install" If you want i will run it again may be today or tomorrow and
> post the result.
>
>
Most likely HASHHDR.mutex is not only bottleneck in your case so my
patch doesn't help much. Unfortunately I don't have access to any
POWER8 server so I can't investigate this issue. I suggest to use a
gettimeofday trick I described in a first message of this thread. Its
time consuming but it gives a clear understanding which code is keeping
a lock.
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