RFC (M) 8058968: Compiler time traces should be improved

Aleksey Shipilev aleksey.shipilev at oracle.com
Wed Sep 24 13:22:13 UTC 2014

On 09/23/2014 08:57 PM, Vladimir Ivanov wrote:
> Looks good to me. Thanks for taking care of this long-standing cleanup.

Thanks for review, Vladimir!

> As a request for further improvements, I'd like to see the following:
> * More fine grained details about "Incremental Inline"
>   We do additional optimization passes during incremental inlining, so
> it'd be great to see where we actually spend time.


I also cleaned up formatting, and put a bit more probes in other places.
This patch finally passes JPRT (modulo some unrelated LF tests
failures), and I think it is ready for prime-time.

Please review and sponsor!

> * The following information segregated by compiler type (C1/C2):
>   Total compiled methods   :  19359 methods
>     Standard compilation   :  19298 methods
>     On stack replacement   :     61 methods
>   Total compiled bytecodes : 4777417 bytes
>     Standard compilation   : 4717650 bytes
>     On stack replacement   :  59767 bytes
>   Average compilation speed:  20330 bytes/s
>   nmethod code size        : 107922240 bytes
>   nmethod total size       : 201508520 bytes

Alas, these counters are also fed into JMX events, and so a bit more
careful rewrite is required to separate for C1/C2 here.

> * Additional statistics about Tiered compilation (compilation task
> counts per level) would be useful here as well.

Ditto, and we would also probably like to expose these things in JMX/JFR

> I'm fine if these enhancements go is as separate changes though.

So recorded:

Current change already covers enough complexity, and provides quite a
few insights into compiler performance, so I would like to see this
pushed in first without stalling for other feature suggestions.


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