X zodb/cache: Allocate OCE from freelist (fbca5755) · Commits · Levin Zimmermann / neoppod

Commit fbca5755 authored Jan 08, 2018 by

Kirill Smelkov

X zodb/cache: Allocate OCE from freelist

This avoid 2 allocations (for oidCacheEntry and for its .revv) for NoHit
cache in steady state, speeding things up a bit via lowering pressure on
go gc.

Startup time increase could be either ignored (because it is only when
N(access) < N(cache-size)) or handled later via explicitly preallocating
OCE pool on cache creation.

---- 8< ----

name old time/op new time/op delta
NoopStorage 56.6ns ± 1% 57.0ns ± 0% +0.77% (p=0.100 n=3+3)
NoopStorage-4 56.4ns ± 0% 57.1ns ± 0% +1.24% (p=0.100 n=3+3)
CacheStartup 1.95µs ± 2% 1.91µs ±10% ~ (p=0.700 n=3+3)
CacheStartup-4 1.31µs ± 5% 1.47µs ± 2% +11.48% (p=0.100 n=3+3)
CacheNoHit/size=0 590ns ± 1% 502ns ± 1% -14.81% (p=0.100 n=3+3)
CacheNoHit/size=0-4 591ns ± 1% 502ns ± 0% -15.06% (p=0.100 n=3+3)
CacheNoHit/size=16 707ns ± 0% 622ns ± 1% -11.98% (p=0.100 n=3+3)
CacheNoHit/size=16-4 711ns ± 1% 623ns ± 1% -12.34% (p=0.100 n=3+3)
CacheNoHit/size=128 717ns ± 0% 624ns ± 0% -12.88% (p=0.100 n=3+3)
CacheNoHit/size=128-4 716ns ± 0% 630ns ± 1% -12.10% (p=0.100 n=3+3)
CacheNoHit/size=512 737ns ± 0% 645ns ± 0% -12.40% (p=0.100 n=3+3)
CacheNoHit/size=512-4 721ns ± 0% 636ns ± 1% -11.84% (p=0.100 n=3+3)
CacheNoHit/size=4096 946ns ± 1% 782ns ± 0% -17.30% (p=0.100 n=3+3)
CacheNoHit/size=4096-4 780ns ± 1% 680ns ± 0% -12.86% (p=0.100 n=3+3)
CacheHit/size=0 589ns ± 1% 507ns ± 0% -13.98% (p=0.100 n=3+3)
CacheHit/size=0-4 588ns ± 0% 503ns ± 1% -14.50% (p=0.100 n=3+3)
CacheHit/size=16 122ns ± 1% 121ns ± 1% ~ (p=0.500 n=3+3)
CacheHit/size=16-4 123ns ± 1% 124ns ± 2% ~ (p=1.000 n=3+3)
CacheHit/size=128 127ns ± 2% 124ns ± 1% ~ (p=0.200 n=3+3)
CacheHit/size=128-4 126ns ± 1% 126ns ± 1% ~ (p=0.600 n=3+3)
CacheHit/size=512 128ns ± 2% 127ns ± 1% ~ (p=0.300 n=3+3)
CacheHit/size=512-4 127ns ± 1% 126ns ± 0% -1.05% (p=0.100 n=3+3)
CacheHit/size=4096 130ns ± 0% 130ns ± 3% ~ (p=0.700 n=3+3)
CacheHit/size=4096-4 130ns ± 1% 129ns ± 1% ~ (p=0.300 n=3+3)
NoopStoragePar 59.7ns ± 3% 57.0ns ± 0% -4.47% (p=0.100 n=3+3)
NoopStoragePar-4 31.3ns ± 8% 30.7ns ± 5% ~ (p=1.000 n=3+3)
CacheStartupPar 1.97µs ±13% 2.19µs ±10% ~ (p=0.400 n=3+3)
CacheStartupPar-4 1.49µs ± 4% 1.71µs ± 4% +14.44% (p=0.100 n=3+3)
CacheNoHitPar/size=0 591ns ± 0% 510ns ± 0% -13.65% (p=0.100 n=3+3)
CacheNoHitPar/size=0-4 811ns ± 0% 726ns ± 0% -10.40% (p=0.100 n=3+3)
CacheNoHitPar/size=16 713ns ± 0% 621ns ± 0% -12.95% (p=0.100 n=3+3)
CacheNoHitPar/size=16-4 924ns ± 0% 826ns ± 0% -10.67% (p=0.100 n=3+3)
CacheNoHitPar/size=128 717ns ± 0% 629ns ± 0% -12.23% (p=0.100 n=3+3)
CacheNoHitPar/size=128-4 953ns ± 0% 848ns ± 0% -11.02% (p=0.100 n=3+3)
CacheNoHitPar/size=512 733ns ± 0% 645ns ± 0% -12.00% (p=0.100 n=3+3)
CacheNoHitPar/size=512-4 972ns ± 0% 881ns ± 0% -9.36% (p=0.100 n=3+3)
CacheNoHitPar/size=4096 941ns ± 0% 788ns ± 0% -16.29% (p=0.100 n=3+3)
CacheNoHitPar/size=4096-4 1.07µs ± 0% 0.96µs ± 0% -10.30% (p=0.100 n=3+3)
CacheHitPar/size=0 587ns ± 0% 509ns ± 0% -13.23% (p=0.100 n=3+3)
CacheHitPar/size=0-4 805ns ± 0% 722ns ± 0% -10.31% (p=0.100 n=3+3)
CacheHitPar/size=16 122ns ± 1% 123ns ± 2% ~ (p=1.000 n=3+3)
CacheHitPar/size=16-4 236ns ± 1% 216ns ± 0% -8.74% (p=0.100 n=3+3)
CacheHitPar/size=128 125ns ± 1% 125ns ± 1% ~ (p=1.000 n=3+3)
CacheHitPar/size=128-4 220ns ± 0% 207ns ± 0% -6.06% (p=0.100 n=3+3)
CacheHitPar/size=512 127ns ± 2% 127ns ± 1% ~ (p=0.600 n=3+3)
CacheHitPar/size=512-4 219ns ± 0% 228ns ± 5% ~ (p=0.600 n=3+3)
CacheHitPar/size=4096 129ns ± 1% 129ns ± 0% ~ (p=1.000 n=3+3)
CacheHitPar/size=4096-4 223ns ± 5% 223ns ± 4% ~ (p=1.000 n=3+3)
NoopStorageProc 54.7ns ± 0% 55.1ns ± 0% +0.67% (p=0.100 n=3+3)
NoopStorageProc-4 31.8ns ± 4% 29.5ns ± 1% -7.14% (p=0.100 n=3+3)
CacheStartupProc 1.88µs ±11% 2.15µs ±11% ~ (p=0.400 n=3+3)
CacheStartupProc-4 1.13µs ± 3% 1.23µs ± 4% +9.04% (p=0.100 n=3+3)
CacheNoHitProc/size=0 598ns ± 0% 500ns ± 0% -16.33% (p=0.100 n=3+3)
CacheNoHitProc/size=0-4 309ns ± 0% 297ns ± 1% -3.89% (p=0.100 n=3+3)
CacheNoHitProc/size=16 711ns ± 0% 615ns ± 0% -13.55% (p=0.100 n=3+3)
CacheNoHitProc/size=16-4 356ns ± 0% 314ns ± 0% -11.88% (p=0.100 n=3+3)
CacheNoHitProc/size=128 722ns ± 1% 622ns ± 0% -13.90% (p=0.100 n=3+3)
CacheNoHitProc/size=128-4 363ns ± 0% 311ns ± 0% -14.25% (p=0.100 n=3+3)
CacheNoHitProc/size=512 741ns ± 1% 640ns ± 0% -13.67% (p=0.100 n=3+3)
CacheNoHitProc/size=512-4 394ns ± 0% 331ns ± 0% -16.06% (p=0.100 n=3+3)
CacheNoHitProc/size=4096 943ns ± 0% 782ns ± 1% -17.04% (p=0.100 n=3+3)
CacheNoHitProc/size=4096-4 565ns ± 0% 462ns ± 0% -18.28% (p=0.100 n=3+3)
CacheHitProc/size=0 598ns ± 0% 498ns ± 0% -16.67% (p=0.100 n=3+3)
CacheHitProc/size=0-4 310ns ± 0% 291ns ± 0% -5.92% (p=0.100 n=3+3)
CacheHitProc/size=16 120ns ± 1% 120ns ± 1% ~ (p=0.600 n=3+3)
CacheHitProc/size=16-4 57.5ns ± 2% 57.2ns ± 1% ~ (p=1.000 n=3+3)
CacheHitProc/size=128 123ns ± 1% 123ns ± 1% ~ (p=1.000 n=3+3)
CacheHitProc/size=128-4 58.1ns ± 0% 57.9ns ± 0% ~ (p=0.200 n=3+3)
CacheHitProc/size=512 126ns ± 2% 126ns ± 1% ~ (p=1.000 n=3+3)
CacheHitProc/size=512-4 58.6ns ± 0% 58.6ns ± 0% ~ (p=1.000 n=3+3)
CacheHitProc/size=4096 128ns ± 1% 127ns ± 1% ~ (p=1.000 n=3+3)
CacheHitProc/size=4096-4 69.8ns ± 0% 70.6ns ± 1% +1.15% (p=0.100 n=3+3)

name old alloc/op new alloc/op delta
NoopStorage 0.00B 0.00B ~ (all equal)
NoopStorage-4 0.00B 0.00B ~ (all equal)
CacheStartup 285B ± 0% 285B ± 0% ~ (all equal)
CacheStartup-4 285B ± 0% 285B ± 0% ~ (all equal)
CacheNoHit/size=0 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheNoHit/size=0-4 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheNoHit/size=16 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHit/size=16-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHit/size=128 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHit/size=128-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHit/size=512 153B ± 0% 97B ± 0% -36.46% (p=0.100 n=3+3)
CacheNoHit/size=512-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHit/size=4096 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHit/size=4096-4 153B ± 0% 97B ± 0% -36.46% (p=0.100 n=3+3)
CacheHit/size=0 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheHit/size=0-4 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheHit/size=16 0.00B 0.00B ~ (all equal)
CacheHit/size=16-4 0.00B 0.00B ~ (all equal)
CacheHit/size=128 0.00B 0.00B ~ (all equal)
CacheHit/size=128-4 0.00B 0.00B ~ (all equal)
CacheHit/size=512 0.00B 0.00B ~ (all equal)
CacheHit/size=512-4 0.00B 0.00B ~ (all equal)
CacheHit/size=4096 0.00B 0.00B ~ (all equal)
CacheHit/size=4096-4 0.00B 0.00B ~ (all equal)
NoopStoragePar 0.00B 0.00B ~ (all equal)
NoopStoragePar-4 0.00B 0.00B ~ (all equal)
CacheStartupPar 285B ± 0% 285B ± 0% ~ (all equal)
CacheStartupPar-4 282B ± 0% 282B ± 1% ~ (p=1.000 n=3+3)
CacheNoHitPar/size=0 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheNoHitPar/size=0-4 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheNoHitPar/size=16 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitPar/size=16-4 154B ± 0% 98B ± 0% -36.36% (p=0.100 n=3+3)
CacheNoHitPar/size=128 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitPar/size=128-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitPar/size=512 153B ± 0% 97B ± 1% -36.82% (p=0.100 n=3+3)
CacheNoHitPar/size=512-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitPar/size=4096 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitPar/size=4096-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheHitPar/size=0 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheHitPar/size=0-4 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheHitPar/size=16 0.00B 0.00B ~ (all equal)
CacheHitPar/size=16-4 0.00B 0.00B ~ (all equal)
CacheHitPar/size=128 0.00B 0.00B ~ (all equal)
CacheHitPar/size=128-4 0.00B 0.00B ~ (all equal)
CacheHitPar/size=512 0.00B 0.00B ~ (all equal)
CacheHitPar/size=512-4 0.00B 0.00B ~ (all equal)
CacheHitPar/size=4096 0.00B 0.00B ~ (all equal)
CacheHitPar/size=4096-4 0.00B 0.00B ~ (all equal)
NoopStorageProc 0.00B 0.00B ~ (all equal)
NoopStorageProc-4 0.00B 0.00B ~ (all equal)
CacheStartupProc 285B ± 0% 285B ± 0% ~ (all equal)
CacheStartupProc-4 285B ± 0% 285B ± 0% ~ (all equal)
CacheNoHitProc/size=0 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheNoHitProc/size=0-4 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheNoHitProc/size=16 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitProc/size=16-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitProc/size=128 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitProc/size=128-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitProc/size=512 153B ± 0% 96B ± 1% -37.04% (p=0.100 n=3+3)
CacheNoHitProc/size=512-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitProc/size=4096 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheNoHitProc/size=4096-4 153B ± 0% 97B ± 0% -36.60% (p=0.100 n=3+3)
CacheHitProc/size=0 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheHitProc/size=0-4 152B ± 0% 96B ± 0% -36.84% (p=0.100 n=3+3)
CacheHitProc/size=16 0.00B 0.00B ~ (all equal)
CacheHitProc/size=16-4 0.00B 0.00B ~ (all equal)
CacheHitProc/size=128 0.00B 0.00B ~ (all equal)
CacheHitProc/size=128-4 0.00B 0.00B ~ (all equal)
CacheHitProc/size=512 0.00B 0.00B ~ (all equal)
CacheHitProc/size=512-4 0.00B 0.00B ~ (all equal)
CacheHitProc/size=4096 0.00B 0.00B ~ (all equal)
CacheHitProc/size=4096-4 0.00B 0.00B ~ (all equal)

name old allocs/op new allocs/op delta
NoopStorage 0.00 0.00 ~ (all equal)
NoopStorage-4 0.00 0.00 ~ (all equal)
CacheStartup 5.00 ± 0% 5.00 ± 0% ~ (all equal)
CacheStartup-4 5.00 ± 0% 5.00 ± 0% ~ (all equal)
CacheNoHit/size=0 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=0-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=16 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=16-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=128 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=128-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=512 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=512-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=4096 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHit/size=4096-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHit/size=0 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHit/size=0-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHit/size=16 0.00 0.00 ~ (all equal)
CacheHit/size=16-4 0.00 0.00 ~ (all equal)
CacheHit/size=128 0.00 0.00 ~ (all equal)
CacheHit/size=128-4 0.00 0.00 ~ (all equal)
CacheHit/size=512 0.00 0.00 ~ (all equal)
CacheHit/size=512-4 0.00 0.00 ~ (all equal)
CacheHit/size=4096 0.00 0.00 ~ (all equal)
CacheHit/size=4096-4 0.00 0.00 ~ (all equal)
NoopStoragePar 0.00 0.00 ~ (all equal)
NoopStoragePar-4 0.00 0.00 ~ (all equal)
CacheStartupPar 5.00 ± 0% 5.00 ± 0% ~ (all equal)
CacheStartupPar-4 4.00 ± 0% 4.33 ±15% ~ (p=1.000 n=3+3)
CacheNoHitPar/size=0 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=0-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=16 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=16-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=128 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=128-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=512 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=512-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=4096 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitPar/size=4096-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHitPar/size=0 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHitPar/size=0-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHitPar/size=16 0.00 0.00 ~ (all equal)
CacheHitPar/size=16-4 0.00 0.00 ~ (all equal)
CacheHitPar/size=128 0.00 0.00 ~ (all equal)
CacheHitPar/size=128-4 0.00 0.00 ~ (all equal)
CacheHitPar/size=512 0.00 0.00 ~ (all equal)
CacheHitPar/size=512-4 0.00 0.00 ~ (all equal)
CacheHitPar/size=4096 0.00 0.00 ~ (all equal)
CacheHitPar/size=4096-4 0.00 0.00 ~ (all equal)
NoopStorageProc 0.00 0.00 ~ (all equal)
NoopStorageProc-4 0.00 0.00 ~ (all equal)
CacheStartupProc 5.00 ± 0% 5.00 ± 0% ~ (all equal)
CacheStartupProc-4 5.00 ± 0% 5.00 ± 0% ~ (all equal)
CacheNoHitProc/size=0 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=0-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=16 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=16-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=128 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=128-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=512 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=512-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=4096 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheNoHitProc/size=4096-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHitProc/size=0 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHitProc/size=0-4 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.100 n=3+3)
CacheHitProc/size=16 0.00 0.00 ~ (all equal)
CacheHitProc/size=16-4 0.00 0.00 ~ (all equal)
CacheHitProc/size=128 0.00 0.00 ~ (all equal)
CacheHitProc/size=128-4 0.00 0.00 ~ (all equal)
CacheHitProc/size=512 0.00 0.00 ~ (all equal)
CacheHitProc/size=512-4 0.00 0.00 ~ (all equal)
CacheHitProc/size=4096 0.00 0.00 ~ (all equal)
CacheHitProc/size=4096-4 0.00 0.00 ~ (all equal)

parent 13f149f0

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Inline Side-by-side

View file @ fbca5755

@@ -222,7 +222,7 @@ func (c *Cache) lookupRCE(xid Xid, wantBufRef int) (rce *revCacheEntry, rceNew b
 		c.mu.Lock()
 		oce = c.entryMap[xid.Oid]
 		if oce == nil {
 			oce = &oidCacheEntry{oid: xid.Oid}
 			oce = oceAlloc(xid.Oid)
 			c.entryMap[xid.Oid] = oce
+		}
 		cacheHead = c.head // reload c.head because we relocked the cache
@@ -516,11 +516,39 @@ func (c *Cache) gc() {
 			// (it could be looked up again in the meantime we were not holding its lock)
 			if len(oce.rcev) == 0 {
 				delete(c.entryMap, oce.oid)
 			} else {
 				oceFree = false
+			}
 			oce.Unlock()
 			c.mu.Unlock()
 			if oceFree {
 				oce.release()
+			}
+		}
+	}
+}
 // freelist(OCE)
 var ocePool = sync.Pool{New: func() interface{} { return &oidCacheEntry{} } }
 // oceAlloc allocates oidCacheEntry from freelist.
 func oceAlloc(oid Oid) *oidCacheEntry {
 	oce := ocePool.Get().(*oidCacheEntry)
 	oce.oid = oid
 	return oce
+}
 // release puts oce back into freelist.
 //
 // Oce must be empty and caller must not use oce after call to release.
 func (oce *oidCacheEntry) release() {
 	if len(oce.rcev) != 0 {
 		panic("oce.release: .rcev != []")
+	}
 	oce.oid = 0 // just in case
 	ocePool.Put(oce)
+}
 // ----------------------------------------
-...

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