Re: how to tune generational collector in work3?
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- Subject: Re: how to tune generational collector in work3?
- From: "Juris Kalnins" <juris@...>
- Date: 2010年6月01日 15:55:42 +0300
On 2010年6月01日 15:47:07 +0300, Roberto Ierusalimschy
<roberto@inf.puc-rio.br> wrote:
>How things are working now?
With the modified stepmul logic and this fix -- great.
Do you think the modified stepmul logic is needed, with the fix?
I'm afraid so. Consider how it works just with the fix:
==========================================================================
$ time ./lua ~/P/gengc-test.lua 500 1000 120 0
shrt lastm 18111339 -> 18111339 totalb 18111175 (-208) debt +44 ->
-21733320
shrt lastm 18111339 -> 18111339 totalb 18167551 (-21664248) debt +36 ->
-21801000
shrt lastm 18111339 -> 18111339 totalb 18211639 (-21756472) debt +16 ->
-21853920
OK, done, maxalloc = 39031.315429688 , #t = 1001
real 0m1.112s
user 0m1.052s
sys 0m0.052s
$ time ./lua ~/P/gengc-test.lua 500 1000 10 0
shrt lastm 18111338 -> 0 totalb 18111174 (-208) debt +44 -> -1811110
full lastm 0 -> 18167506 totalb 18167506 (-1742060) debt +14 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
full lastm 0 -> 18167506 totalb 18167506 (-1816332) debt +38 -> -1816750
shrt lastm 18167506 -> 0 totalb 18167506 (-1816332) debt +38 -> -1816750
OK, done, maxalloc = 19515.423828125 , #t = 1001
real 0m1.735s
user 0m1.692s
sys 0m0.016s
==========================================================================
Since short collection frequency is tied to the totalbytes, it either
collects rarely (gcpause > 100%) or it always triggers fullgc (gcpause <
100%)