#13668: Space leak re-introduced -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Test `perf/compiler/T9675` is failing for me on a clean HEAD {{{ =====> T9675(optasm) 1 of 1 [0, 0, 0] cd "./T9675.run" && "/5playpen/simonpj/HEAD-5/inplace/test spaces/ghc- stage2" -c T9675.hs -no-user-package-db -rtsopts -fno-warn-missed- specialisations -fshow-warning-groups -fdiagnostics-color=never -fno- diagnostics-show-caret -dno-debug-output +RTS -G1 -RTS -O -fasm +RTS -V0 -tT9675.comp.stats --machine-readable -RTS"/5playpen/simonpj/HEAD-5/inplace/test spaces/ghc-stage2" -c T9675.hs -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show- caret -dno-debug-output +RTS -G1 -RTS -O -fasm +RTS -V0 -tT9675.comp.stats --machine-readable -RTS max_bytes_used value is too high: Expected T9675(optasm) max_bytes_used: 17675240 +/-15% Lower bound T9675(optasm) max_bytes_used: 15023954 Upper bound T9675(optasm) max_bytes_used: 20326526 Actual T9675(optasm) max_bytes_used: 25571248 Deviation T9675(optasm) max_bytes_used: 44.7 % peak_megabytes_allocated value is too high: Expected T9675(optasm) peak_megabytes_allocated: 63 +/-15% Lower bound T9675(optasm) peak_megabytes_allocated: 53 Upper bound T9675(optasm) peak_megabytes_allocated: 73 Actual T9675(optasm) peak_megabytes_allocated: 93 Deviation T9675(optasm) peak_megabytes_allocated: 47.6 % *** unexpected stat test failure for T9675(optasm) }}} Compiling with `-RTS -S` gives {{{ Alloc Copied Live GC GC TOT TOT Page Flts bytes bytes bytes user elap user elap 1139048 56288 158880 0.028 0.028 0.032 0.032 0 0 (Gen: 0) 1036832 99080 193448 0.018 0.018 0.052 0.052 0 0 (Gen: 0) 1036784 137552 223696 0.018 0.018 0.073 0.073 0 0 (Gen: 0) 1015208 145088 231232 0.018 0.018 0.094 0.094 0 0 (Gen: 0) 1084448 505864 636944 0.019 0.019 0.116 0.116 0 0 (Gen: 0) 1039312 660432 783288 0.020 0.020 0.137 0.137 0 0 (Gen: 0) 1377128 845976 1001624 0.020 0.020 0.159 0.159 0 0 (Gen: 0) 1707720 1168392 1352664 0.024 0.024 0.186 0.186 0 0 (Gen: 0) 2411008 1554360 1764288 0.023 0.023 0.214 0.214 0 0 (Gen: 0) 3128632 1885104 2164224 0.021 0.021 0.239 0.240 0 0 (Gen: 0) 3891928 3029560 3501264 0.025 0.025 0.271 0.272 0 0 (Gen: 0) 6618768 4554248 5412752 0.031 0.031 0.312 0.313 0 0 (Gen: 0) 8966136 5509176 6359368 0.033 0.033 0.358 0.359 0 0 (Gen: 0) 10948736 6299736 7158072 0.034 0.034 0.409 0.410 0 0 (Gen: 0) 12489360 8415312 9277728 0.043 0.044 0.466 0.468 0 0 (Gen: 0) 16486944 7800096 8662512 0.043 0.043 0.528 0.529 0 0 (Gen: 0) 15450408 9812088 10674504 0.044 0.044 0.590 0.591 0 0 (Gen: 0) 19459168 11429320 12291736 0.054 0.054 0.671 0.673 0 0 (Gen: 0) 22684384 8611624 9474040 0.046 0.046 0.745 0.747 0 0 (Gen: 0) 17026576 10661064 11523480 0.045 0.045 0.810 0.812 0 0 (Gen: 0) 21146552 9790592 10653008 0.044 0.044 0.882 0.884 0 0 (Gen: 0) 19421144 9891256 10753672 0.045 0.045 0.955 0.957 0 0 (Gen: 0) 19622512 8678360 9540776 0.042 0.042 1.026 1.028 0 0 (Gen: 0) 17212344 9845688 10708104 0.042 0.042 1.088 1.091 0 0 (Gen: 0) 19568256 9928304 10790720 0.045 0.045 1.159 1.162 0 0 (Gen: 0) 19673096 8159672 9022088 0.040 0.040 1.223 1.226 0 0 (Gen: 0) 16172824 9362616 10225032 0.039 0.039 1.277 1.280 0 0 (Gen: 0) 18536544 10809776 11672192 0.051 0.051 1.347 1.350 0 0 (Gen: 0) 21412128 15177144 16039560 0.065 0.065 1.434 1.437 0 0 (Gen: 0) 30181520 16438872 17301288 0.071 0.071 1.541 1.544 0 0 (Gen: 0) 32568088 11742016 12604432 0.053 0.053 1.633 1.636 0 0 (Gen: 0) 23285000 13139928 14002344 0.054 0.054 1.714 1.718 0 0 (Gen: 0) 26054072 15188040 16050456 0.060 0.060 1.803 1.807 0 0 (Gen: 0) 30184528 10990656 11853072 0.050 0.050 1.890 1.894 0 0 (Gen: 0) 21814064 12636584 13499000 0.050 0.050 1.961 1.965 0 0 (Gen: 0) 25295544 13754616 14812696 0.059 0.059 2.048 2.052 0 0 (Gen: 0) 27448728 16160496 17210352 0.066 0.066 2.147 2.151 0 0 (Gen: 0) 30295624 22372880 24471344 0.090 0.090 2.279 2.283 0 0 (Gen: 0) 44477824 24497712 25572240 0.092 0.092 2.431 2.436 0 0 (Gen: 0) 48692880 2937512 3436608 0.017 0.017 2.548 2.571 0 0 (Gen: 0) 1840 0.000 0.000 662,063,640 bytes allocated in the heap 334,683,080 bytes copied during GC 25,572,240 bytes maximum residency (40 sample(s)) 1,194,192 bytes maximum slop 93 MB total memory in use (0 MB lost due to fragmentation) Tot time (elapsed) Avg pause Max pause Gen 0 40 colls, 0 par 1.684s 1.685s 0.0421s 0.0924s TASKS: 4 (1 bound, 3 peak workers (3 total), using -N1) SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled) INIT time 0.001s ( 0.001s elapsed) MUT time 0.862s ( 0.885s elapsed) GC time 1.684s ( 1.685s elapsed) EXIT time 0.001s ( 0.009s elapsed) Total time 2.549s ( 2.581s elapsed) Alloc rate 767,692,191 bytes per MUT second Productivity 33.9% of total user, 34.6% of total elapsed }}} It looks as if a space leak has come back; space usage on this benchmark dropped by half when Reid fixed the `CoreTidy` leak. I don't know which commit re-introduced it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13668 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler