[LLVMdev] Prevent unbounded memory consuption of long lived JIT processes

[Jakob Stoklund Olesen]

On Mar 16, 2011, at 6:19 AM, José Fonseca wrote:

> On Tue, 2011-03-15 at 20:29 -0700, Jakob Stoklund Olesen wrote:
>> On Mar 15, 2011, at 4:15 PM, jfonseca at vmware.com wrote:
>> 
>>> This series of patches address several issues causing memory usage to grow
>>> indefinetely on a long lived process.
>> 
>> Thanks for working on this.
>> 
>> Did you measure the performance impact of these changes?
> 
> I tracked performance with this change with X86 JIT and there was no
> measurable difference, but the performance was governed more by the
> quality of the compiled code, and not so much the compilation time.
> 
> If you can point me to a good compilation time benchmark I can get some
> figures.

I normally use 403.gcc, but if you don't have SPEC sources, these tests in the nightly test suite take a while to compile:

MultiSource/Applications/ClamAV
MultiSource/Applications/JM/ldecod
MultiSource/Applications/JM/lencod
MultiSource/Applications/SPASS
MultiSource/Applications/kimwitu++/kc
MultiSource/Applications/sqlite3/sqlite3

If you run 'make TEST=nightly', both llc and opt compile times are interesting. The runtime of opt is cryptically reported in the GCCAS column.

/jakob