[firebase-br] [Firebird-devel] Test of new GC thread

[Julio Cesar]

e ainda tem gente q diz q o FB e um banquinho...... o FB vai voando cada vez
mais rapido....



Julio Cesar
julio_gyn em yahoo.com.br
+353 (87) 2184139
+353 (091) 630317
----- Original Message ----- 
From: "Carlos H. Cantu" <listas em warmboot.com.br>
To: <lista em firebase.com.br>
Sent: Thursday, October 07, 2004 4:03 PM
Subject: [firebase-br] [Firebird-devel] Test of new GC thread


> This is a forwarded message
> From: Vlad Horsun <hvlad em users.sourceforge.net>
> To: firebird-devel em lists.sourceforge.net
> Date: Thursday, October 7, 2004, 9:31:35 AM
> Subject: [Firebird-devel] Test of new GC thread
>
> ===8<==============Original message text===============
>     Hi, All
>
>     Since Arno fixed problems with indexes (thank you,
> Arno!) i can continue testing new garbage collector thread.
>
>     Now i made multiuser test to see how gc_thread affects
> performance. I run 16 isql's one by one (serial test) and
> simultaneously (parallel test), each of it execute the same
> script as in prior test.
>
>     After each test series database was checked (gfix -v -f),
> gstat was running to see how much garbage left and sweeped.
> Database has 512 page cache set.
>
> Results :
>
> 1. No garbage collector thread
>     a) serial test
>        runs               4
>        avg run time      54.37
>        sum run time     217.48
>        garbage left   14252
>
>     b) parallel test
>        runs             16
>        avg run time     35.14
>        max run time     38.80
>        garbage left  57008
>
> 2. Old garbage collector
>     a) serial test
>        runs               4
>        avg run time      54.09
>        sum run time     216.34
>        garbage left   14252
>
>     b) parallel test
>        runs             16
>        avg run time     30.18
>        max run time     37.93
>        garbage left  57008
>
> 3. New garbage collector + cooperative gc
>     a) serial test
>        runs              16
>        avg run time       2.53
>        sum run time      40.46
>        garbage left       1
>
>     b) parallel test
>        runs             16
>        avg run time     31.45
>        max run time     39.48
>        garbage left   1157
>
> 4. New "pure" garbage collector (no cooperative gc)
>     a) serial test
>        runs              16
>        avg run time       2.51
>        sum run time      40.21
>        garbage left       9
>
>     b) parallel test
>        runs             16
>        avg run time     38.08
>        max run time     39.92
>        garbage left    750
>
>     In (1) and (2) serial test was stopped after 4th run
> due to very long execution time (from 2.4 to 175 sec)
>
>     New garbage collector implementation was described
> earlier in this list
>
>     (3) New garbage collector + cooperative gc means :
> when user thread reads record which have backversion than
> user thread tried to purge it (if OST allows) or notified
> garbage collector about it
>
>     (4) New "pure" garbage collector means :
> when user thread reads record which have backversion than
> user thread just notified garbage collector about it (same
> as old gc thread)
>
>
>     Conclusions :
>
>     a) run time of parallel test differs a little between
>        each gc strategy so we can say that new garbage
>        collector thread don't affect performance much
>
>     b) new gc_thread collects almost all garbage
>
>     c) run time of parallel and serial tests with new
>        gc_thread are near equal, but serial test with
>        old gc_thread (or without gc_thread) are slower
>        and slower
>
> Regards,
> Vlad
>
>
>
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> ===8<===========End of original message text===========
>
>
>
>
>
>


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