On 05 December 2013 21:16 Amit Kapila wrote:
> Note -
> a. Performance is data is taken on my laptop, needs to be tested on
> some better m/c b. Attached Patch is just a prototype of chunkwise
> concept, code needs to be improved and decode
> handling/test is pending.
I ran the performance test on linux machine and attached the results in the
mail.
Regards,
Hari babu.
Performance Data
-----------------
Machine:
CPU - 4 core
RAM - 24GB
OS - SUSE 11 SP2
Configurations:
Encoding - SQL_ASCII
lc-collate - C
lc-ctype - C
Sharedbuffers - 4GB
walbuffers - 16MB
synchronous_commit - off
checkpoint_segments - 255
checkpoint_timeout - 25min
autovacuum - off
NORMAL DISK:
Head code:
testname | wal_generated | duration
---------------------------------------+---------------+------------------
ten tiny fields, all changed | 1408441624 | 42.9247660636902
hundred tiny fields, first 10 changed | 623904568 | 19.5896420478821
hundred tiny fields, all changed | 626929520 | 20.4015860557556
hundred tiny fields, half changed | 632949424 | 20.4108989238739
hundred tiny fields, half nulled | 568672600 | 16.9662220478058
(5 rows)
lz snappy hash delta encoding
testname | wal_generated | duration
---------------------------------------+---------------+------------------
ten tiny fields, all changed | 1314962968 | 39.8615770339966
hundred tiny fields, first 10 changed | 452513816 | 16.8626310825348
hundred tiny fields, all changed | 458503728 | 18.5805869102478
hundred tiny fields, half changed | 463203696 | 17.7005319595337
hundred tiny fields, half nulled | 472732888 | 17.7074511051178
(5 rows)
robin delta encoding
testname | wal_generated | duration
---------------------------------------+---------------+------------------
ten tiny fields, all changed | 1321761080 | 40.9638168811798
hundred tiny fields, first 10 changed | 501064768 | 18.8991298675537
hundred tiny fields, all changed | 631711040 | 22.2287940979004
hundred tiny fields, half changed | 628356072 | 21.4988770484924
hundred tiny fields, half nulled | 506637272 | 18.4065499305725
(5 rows)
TEMPFS:
Head code:
testname | wal_generated | duration
---------------------------------------+---------------+------------------
ten tiny fields, all changed | 1395199584 | 23.9126200675964
hundred tiny fields, first 10 changed | 636436752 | 13.5280549526215
hundred tiny fields, all changed | 635591368 | 13.5622470378876
hundred tiny fields, half changed | 628001440 | 13.5341370105743
hundred tiny fields, half nulled | 564033176 | 12.3501629829407
(5 rows)
lz snappy hash delta encoding
testname | wal_generated | duration
---------------------------------------+---------------+------------------
ten tiny fields, all changed | 1314964400 | 23.2445130348206
hundred tiny fields, first 10 changed | 456703104 | 14.2320129871368
hundred tiny fields, all changed | 463224736 | 14.0170950889587
hundred tiny fields, half changed | 462589768 | 14.032851934433
hundred tiny fields, half nulled | 473361760 | 13.3050961494446
(5 rows)
robin delta encoding
testname | wal_generated | duration
---------------------------------------+---------------+------------------
ten tiny fields, all changed | 1319550032 | 23.7516498565674
hundred tiny fields, first 10 changed | 512198256 | 15.0410940647125
hundred tiny fields, all changed | 638134296 | 15.143513917923
hundred tiny fields, half changed | 635378360 | 15.1855199337006
hundred tiny fields, half nulled | 508630832 | 13.4496691226959
(5 rows)
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