Re: Reduce timing overhead of EXPLAIN ANALYZE using rdtsc?

David Geier <geidav.pg@gmail.com>

From: David Geier <geidav.pg@gmail.com>

To: Michael Paquier <michael@paquier.xyz>, Ibrar Ahmed <ibrar.ahmad@gmail.com>

Cc: Maciek Sakrejda <m.sakrejda@gmail.com>, Andres Freund <andres@anarazel.de>, Lukas Fittl <lukas@fittl.com>, pgsql-hackers <pgsql-hackers@postgresql.org>

Date: 2022-11-19T20:06:23Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

pg_test_timing: Also test RDTSC[P] timing, report time source, TSC frequency
- 16fca4825483 19 (unreleased) landed
Allow retrieving x86 TSC frequency/flags from CPUID
- bcb2cf41f964 19 (unreleased) landed
instrumentation: Standardize ticks to nanosecond conversion method
- 0022622c93d9 19 (unreleased) landed
instrumentation: Use Time-Stamp Counter on x86-64 to lower overhead
- 294520c44487 19 (unreleased) landed
Zero initialize uses of instr_time about to trigger compiler warnings
- 25b2aba0c3a5 16.0 landed
instr_time: Represent time as an int64 on all platforms
- 03023a2664f8 16.0 landed
Add 250c8ee07ed to git-blame-ignore-revs
- ff23b592ad66 16.0 cited

Attachments

0001-WIP-Change-instr_time-to-just-store-nanoseconds-v3.patch (text/x-patch) patch v3-0001
0002-WIP-Use-cpu-reference-cycles-via-rdtsc-to-measure-v3.patch (text/x-patch) patch v3-0002

I missed attaching the patches.

-- 
David Geier
(ServiceNow)