On 09/06/2016 04:49 AM, Amit Kapila wrote: > On Mon, Sep 5, 2016 at 11:34 PM, Tomas Vondra > <tomas.von...@2ndquadrant.com> wrote: >> >> >> On 09/05/2016 06:03 AM, Amit Kapila wrote: >>> So, in short we have to compare three >>> approaches here. >>> >>> 1) Group mode to reduce CLOGControlLock contention >>> 2) Use granular locking model >>> 3) Use atomic operations >>> >>> For approach-1, you can use patch [1]. For approach-2, you can use >>> 0001-Improve-64bit-atomics-support patch[2] and the patch attached >>> with this mail. For approach-3, you can use >>> 0001-Improve-64bit-atomics-support patch[2] and the patch attached >>> with this mail by commenting USE_CONTENT_LOCK. If the third doesn't >>> work for you then for now we can compare approach-1 and approach-2. >>> >> >> OK, I can compile all three cases - but onl with gcc 4.7 or newer. Sadly >> the 4-socket 64-core machine runs Debian Jessie with just gcc 4.6 and my >> attempts to update to a newer version were unsuccessful so far. >> > > So which all patches your are able to compile on 4-socket m/c? I > think it is better to measure the performance on bigger machine.
Oh, sorry - I forgot to mention that only the last test (with USE_CONTENT_LOCK commented out) fails to compile, because the functions for atomics were added in gcc-4.7. regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
