Re: stuck spin lock with many concurrent users - Mailing list pgsql-hackers

From Tom Lane
Subject Re: stuck spin lock with many concurrent users
Date
Msg-id 10556.993394909@sss.pgh.pa.us
Whole thread Raw
In response to Re: stuck spin lock with many concurrent users  (Tatsuo Ishii <t-ishii@sra.co.jp>)
Responses Re: stuck spin lock with many concurrent users  (Tatsuo Ishii <t-ishii@sra.co.jp>)
List pgsql-hackers
Tatsuo Ishii <t-ishii@sra.co.jp> writes:
> I got an interesting result. If I compile backend with -g (and without
> -O2), I get no stuck spin lock errors. However, if s_lock.c is
> compiled with -O2 enabled, I got the error again. It seems only
> s_lock.c is related to this phenomenon.

That's very interesting.  Could optimization be breaking the TAS
sequence on your platform?  What is your platform, anyway?
Might need to burrow into the assembly code to see just what's
happening.
        regards, tom lane


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