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2015 Jan 27
5
[LLVMdev] [cfe-dev][llvmdev] Clang 3.6 and trunk, high RSS usage compared to GCC (12.5GB vs. 0.5GB)
...cd9ceaab70fc7868332f20e2758f) our internal build machines started
going offline in Jenkins. Clang after 3.5 release is consuming extreme amounts
of memory in some cases.
I have uploaded [1] one of affected files.
$ g++ -std=c++11 -c -O1 -fPIC vpp_generated.ii -o vpp_generated.o
vmpeak: 582432 KB
rspeak: 504500 KB = ~ 0.5GB
$ clang++ -std=c++11 -c -O1 -fPIC vpp_generated.ii -o vpp_generated.o
vmpeak: 12992076 KB
rspeak: 12820184 KB = ~12.5GB
Disabling optimzer (-O0) resolves the issue, and RSS usage drops to ~300MB.
I decided to write here directly instead of creating yet another bug report,
w...