mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-24 02:35:41 +00:00
0f418f3874
DMD currently uses a very hacky form of "sampling" by default to avoid
recording stack traces for all blocks. This makes DMD run faster than when it
records all stack traces.
This patch changes the sampling method used; in fact, it avoids "sampling" at
all. The existence of all heap blocks is now recorded exactly, but by default
we only record an allocation stack for each heap block if a Bernoulli trial
succeeds. This choice works well because getting the stack trace is ~100x
slower than recording the block's existence.
Overall, this approach is simpler and it also gives better output -- the choice
of which blocks to record allocation stacks for is mathematically sound, no
stack trace gets blamed for allocations it didn't do, and block counts and
sizes are now always exact.
Other specific things changed.
- All notion of sampling is removed from the various data structures.
- The --sample-below option is removed in favour of --stacks={partial,full}.
- The format of the JSON output file has changed.
- The names of various test files have changed to reflect concept changes.
--HG--
rename : memory/replace/dmd/test/full-empty-cumulative-expected.txt => memory/replace/dmd/test/complete-empty-cumulative-expected.txt
rename : memory/replace/dmd/test/full-empty-dark-matter-expected.txt => memory/replace/dmd/test/complete-empty-dark-matter-expected.txt
rename : memory/replace/dmd/test/full-empty-live-expected.txt => memory/replace/dmd/test/complete-empty-live-expected.txt
rename : memory/replace/dmd/test/full-unsampled1-dark-matter-expected.txt => memory/replace/dmd/test/complete-full1-dark-matter-expected.txt
rename : memory/replace/dmd/test/full-unsampled1-live-expected.txt => memory/replace/dmd/test/complete-full1-live-expected.txt
rename : memory/replace/dmd/test/full-unsampled2-cumulative-expected.txt => memory/replace/dmd/test/complete-full2-cumulative-expected.txt
rename : memory/replace/dmd/test/full-unsampled2-dark-matter-expected.txt => memory/replace/dmd/test/complete-full2-dark-matter-expected.txt
rename : memory/replace/dmd/test/full-sampled-live-expected.txt => memory/replace/dmd/test/complete-partial-live-expected.txt
extra : rebase_source : 47d287405dc5e9075f08addaba49e879c2c6e23f
128 lines
3.2 KiB
Plaintext
128 lines
3.2 KiB
Plaintext
#-----------------------------------------------------------------
|
|
# dmd.py --filter-stacks-for-testing -o script-diff-dark-matter-actual.txt script-diff-dark-matter1.json script-diff-dark-matter2.json
|
|
|
|
Invocation 1 {
|
|
$DMD = '--mode=dark-matter'
|
|
Mode = 'dark-matter'
|
|
}
|
|
|
|
Invocation 2 {
|
|
$DMD is undefined
|
|
Mode = 'dark-matter'
|
|
}
|
|
|
|
#-----------------------------------------------------------------
|
|
|
|
Twice-reported {
|
|
-1 blocks in heap block record 1 of 1
|
|
-1,088 bytes (-1,064 requested / -24 slop)
|
|
Individual block sizes: -1,024; -127; 63
|
|
15.46% of the heap (15.46% cumulative)
|
|
100.00% of twice-reported (100.00% cumulative)
|
|
Allocated at {
|
|
#01: F (F.cpp:99)
|
|
}
|
|
Reported at {
|
|
#01: R1 (R1.cpp:99)
|
|
}
|
|
Reported again at {
|
|
#01: R2 (R2.cpp:99)
|
|
}
|
|
}
|
|
|
|
#-----------------------------------------------------------------
|
|
|
|
Unreported {
|
|
4 blocks in heap block record 1 of 5
|
|
16,384 bytes (16,384 requested / 0 slop)
|
|
Individual block sizes: 4,096 x 4
|
|
-232.76% of the heap (-232.76% cumulative)
|
|
371.01% of unreported (371.01% cumulative)
|
|
Allocated at {
|
|
#01: E (E.cpp:99)
|
|
}
|
|
}
|
|
|
|
Unreported {
|
|
7 blocks in heap block record 2 of 5
|
|
-11,968 bytes (-12,016 requested / 48 slop)
|
|
Individual block sizes: -15,360; 2,048; 512 x 2; 128; -127; 64 x 4; 63
|
|
170.02% of the heap (-62.74% cumulative)
|
|
-271.01% of unreported (100.00% cumulative)
|
|
Allocated at {
|
|
#01: F (F.cpp:99)
|
|
}
|
|
}
|
|
|
|
Unreported {
|
|
0 blocks in heap block record 3 of 5
|
|
0 bytes (-384 requested / 384 slop)
|
|
Individual block sizes: (no change)
|
|
-0.00% of the heap (-62.74% cumulative)
|
|
0.00% of unreported (100.00% cumulative)
|
|
Allocated at {
|
|
#01: C (C.cpp:99)
|
|
}
|
|
}
|
|
|
|
Unreported {
|
|
-2 blocks in heap block record 4 of 5
|
|
0 bytes (0 requested / 0 slop)
|
|
Individual block sizes: 8,192 x 2; -4,096 x 4
|
|
-0.00% of the heap (-62.74% cumulative)
|
|
0.00% of unreported (100.00% cumulative)
|
|
Allocated at {
|
|
#01: B (B.cpp:99)
|
|
}
|
|
}
|
|
|
|
Unreported {
|
|
0 blocks in heap block record 5 of 5
|
|
0 bytes (0 requested / 0 slop)
|
|
Individual block sizes: 20,480; -16,384; -8,192; 4,096
|
|
-0.00% of the heap (-62.74% cumulative)
|
|
0.00% of unreported (100.00% cumulative)
|
|
Allocated at {
|
|
#01: (no stack trace recorded due to --stacks=partial)
|
|
}
|
|
}
|
|
|
|
#-----------------------------------------------------------------
|
|
|
|
Once-reported {
|
|
-3 blocks in heap block record 1 of 2
|
|
-10,240 bytes (-10,192 requested / -48 slop)
|
|
Individual block sizes: -4,096 x 2; -2,048
|
|
145.48% of the heap (145.48% cumulative)
|
|
98.77% of once-reported (98.77% cumulative)
|
|
Allocated at {
|
|
#01: D (D.cpp:99)
|
|
}
|
|
Reported at {
|
|
#01: R1 (R1.cpp:99)
|
|
}
|
|
}
|
|
|
|
Once-reported {
|
|
-1 blocks in heap block record 2 of 2
|
|
-127 bytes (-151 requested / 24 slop)
|
|
1.80% of the heap (147.28% cumulative)
|
|
1.23% of once-reported (100.00% cumulative)
|
|
Allocated at {
|
|
#01: F (F.cpp:99)
|
|
}
|
|
Reported at {
|
|
#01: R1 (R1.cpp:99)
|
|
}
|
|
}
|
|
|
|
#-----------------------------------------------------------------
|
|
|
|
Summary {
|
|
Total: -7,039 bytes (100.00%) in 4 blocks (100.00%)
|
|
Unreported: 4,416 bytes (-62.74%) in 9 blocks (225.00%)
|
|
Once-reported: -10,367 bytes (147.28%) in -4 blocks (-100.00%)
|
|
Twice-reported: -1,088 bytes ( 15.46%) in -1 blocks (-25.00%)
|
|
}
|
|
|