Arjun Roy
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54a3b64246
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Pull() eats slice from sbuf wrapped byte buffer.
At present, a commonly used byte buffer wraps an underlying slice
buffer. This is used by grpc_call; it passes a byte buffer for send
stream ops through the filter stack and down to the transport.
Pull() is a one-way operation; given a slice-buffer backed
byte-buffer, it starts with a cursor at index=0 and increments it per
pull. There is no way for a cursor to be rewinded.
Originally Pull() would ref the slice and return a copy; the
slice remains in the underlying buffer and is eventually cleaned up
(unref'd). Thus, assuming a slice buffer of size N and assuming we
pulled all N slices then we have a total of 2N ref/unref pairs.
Since Pull() is essentially acting as a consume operation here, and
since it is a one-way operation, we simply transfer the ref rather
than create a new ref. This cuts down atomic ops. from 2N to N.
This reduces streaming latency slightly for streaming fullstack
microbenchmarks:
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/0/1
[polls/iter:0 ] 8.87µs ± 1%
8.91µs ± 1% +0.45% (p=0.002 n=20+20)
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/0/2
[polls/iter:0 ] 11.7µs ± 1%
11.7µs ± 1% +0.34% (p=0.002 n=19+19)
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/8/1
[polls/iter:0 ] 9.11µs ± 1%
9.14µs ± 1% +0.29% (p=0.016 n=19+20)
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/64/1
[polls/iter:0 ] 9.29µs ± 1%
9.27µs ± 1% -0.23% (p=0.029 n=18+19)
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/512/2
[polls/iter:0 ] 13.0µs ± 1%
12.9µs ± 1% -0.52% (p=0.000 n=20+19)
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/4096/1
[polls/iter:0 ] 11.8µs ± 1%
11.8µs ± 1% -0.41% (p=0.007 n=20+20)
BM_StreamingPingPong<InProcess, NoOpMutator, NoOpMutator>/4096/2
[polls/iter:0 ] 17.4µs ± 1%
17.2µs ± 1% -0.73% (p=0.000 n=19+19)
BM_StreamingPingPongMsgs<InProcess, NoOpMutator, NoOpMutator>/1
[polls/iter:0 ] 2.87µs ± 1%
2.84µs ± 1% -1.18% (p=0.000 n=19+18)
BM_StreamingPingPongMsgs<InProcess, NoOpMutator, NoOpMutator>/8
[polls/iter:0 ] 2.85µs ± 1%
2.84µs ± 0% -0.38% (p=0.022 n=20+17)
BM_StreamingPingPongMsgs<InProcess, NoOpMutator, NoOpMutator>/64
[polls/iter:0 ] 3.00µs ± 1%
2.95µs ± 1% -1.64% (p=0.000 n=19+19)
BM_StreamingPingPongMsgs<InProcess, NoOpMutator, NoOpMutator>/512
[polls/iter:0 ] 3.32µs ± 1%
3.23µs ± 1% -2.62% (p=0.000 n=20+20)
BM_StreamingPingPongMsgs<InProcess, NoOpMutator, NoOpMutator>/4096
[polls/iter:0 ] 5.38µs ± 2%
5.30µs ± 1% -1.42% (p=0.000 n=19+20)
BM_StreamingPingPongMsgs<InProcess, NoOpMutator, NoOpMutator>/32768
[polls/iter:0 ] 24.1µs ± 1%
24.0µs ± 0% -0.47% (p=0.000 n=19+18)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/0/0
[polls/iter:0 ] 5.71µs ± 1%
5.69µs ± 1% -0.36% (p=0.010 n=19+19)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/0/1
[polls/iter:0 ] 8.64µs ± 1%
8.68µs ± 1% +0.38% (p=0.004 n=20+18)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/1/2
[polls/iter:0 ] 11.9µs ± 1%
11.8µs ± 1% -0.36% (p=0.003 n=20+18)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/64/1
[polls/iter:0 ] 9.09µs ± 1%
9.06µs ± 1% -0.32% (p=0.046 n=20+20)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/64/2
[polls/iter:0 ] 12.2µs ± 0%
12.1µs ± 1% -0.35% (p=0.001 n=19+20)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/512/2
[polls/iter:0 ] 12.8µs ± 1%
12.7µs ± 1% -0.46% (p=0.000 n=19+19)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/4096/1
[polls/iter:0 ] 11.7µs ± 2%
11.6µs ± 1% -0.58% (p=0.004 n=20+20)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/4096/2
[polls/iter:0 ] 17.1µs ± 1%
17.0µs ± 1% -0.55% (p=0.010 n=20+20)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/32768/1
[polls/iter:0 ] 30.5µs ± 1%
30.6µs ± 0% +0.27% (p=0.003 n=20+19)
BM_StreamingPingPong<MinInProcess, NoOpMutator, NoOpMutator>/262144/2
[polls/iter:0 ] 363µs ± 1%
362µs ± 1% -0.22% (p=0.049 n=20+20)
BM_StreamingPingPongMsgs<MinInProcessCHTTP2, NoOpMutator,
NoOpMutator>/134217728 [polls/iter:4 writes/iter:8.5
] 266ms ± 0% 263ms ± 1% -1.23%
(p=0.029 n=4+4)
BM_StreamingPingPongMsgs<MinInProcess, NoOpMutator, NoOpMutator>/64
[polls/iter:0 ] 2.95µs ± 1%
2.93µs ± 1% -0.97% (p=0.000 n=19+20)
BM_StreamingPingPongMsgs<MinInProcess, NoOpMutator, NoOpMutator>/512
[polls/iter:0 ] 3.27µs ± 1%
3.19µs ± 1% -2.32% (p=0.000 n=20+20)
BM_StreamingPingPongMsgs<MinInProcess, NoOpMutator, NoOpMutator>/4096
[polls/iter:0 ] 5.33µs ± 2%
5.26µs ± 1% -1.30% (p=0.000 n=20+20)
BM_StreamingPingPongMsgs<MinInProcess, NoOpMutator, NoOpMutator>/32768
[polls/iter:0 ] 24.1µs ± 1%
24.0µs ± 0% -0.35% (p=0.001 n=19+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/0/2/1 [polls/iter:0
] 10.6µs ± 1% 10.6µs ± 1% +0.45%
(p=0.014 n=20+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/1/2/0 [polls/iter:0
] 11.3µs ± 1% 11.3µs ± 1% -0.39%
(p=0.046 n=20+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/1/1/1 [polls/iter:0
] 7.92µs ± 1% 7.88µs ± 1% -0.46%
(p=0.012 n=19+18)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/1/2/1 [polls/iter:0
] 11.0µs ± 1% 10.9µs ± 1% -0.48%
(p=0.001 n=18+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/8/1/0 [polls/iter:0
] 8.33µs ± 1% 8.30µs ± 1% -0.29%
(p=0.025 n=19+19)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/8/2/0 [polls/iter:0
] 11.3µs ± 1% 11.3µs ± 1% -0.34%
(p=0.011 n=19+19)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/64/1/0 [polls/iter:0
] 8.49µs ± 1% 8.41µs ± 1% -1.01%
(p=0.000 n=20+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/64/2/0 [polls/iter:0
] 11.6µs ± 1% 11.5µs ± 1% -0.80%
(p=0.000 n=19+19)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/64/1/1 [polls/iter:0
] 8.06µs ± 1% 8.02µs ± 1% -0.51%
(p=0.016 n=20+19)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/64/2/1 [polls/iter:0
] 11.2µs ± 1% 11.1µs ± 1% -0.69%
(p=0.000 n=19+18)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/512/1/0 [polls/iter:0
] 8.83µs ± 1% 8.71µs ± 1% -1.34%
(p=0.000 n=20+19)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/512/2/0 [polls/iter:0
] 12.2µs ± 1% 12.1µs ± 1% -1.35%
(p=0.000 n=19+17)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/512/1/1 [polls/iter:0
] 8.40µs ± 1% 8.32µs ± 1% -0.92%
(p=0.000 n=20+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/512/2/1 [polls/iter:0
] 11.9µs ± 1% 11.7µs ± 1% -1.04%
(p=0.000 n=19+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/4096/1/0 [polls/iter:0
] 11.1µs ± 1% 11.0µs ± 1% -0.53%
(p=0.002 n=20+19)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/4096/2/0 [polls/iter:0
] 16.6µs ± 1% 16.5µs ± 2% -0.47%
(p=0.023 n=20+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/32768/1/1 [polls/iter:0
] 29.6µs ± 1% 29.7µs ± 1% +0.36%
(p=0.000 n=20+20)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/2097152/1/0 [polls/iter:0
] 1.59ms ± 9% 1.48ms ± 1% -7.02%
(p=0.001 n=20+16)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/2097152/2/0 [polls/iter:0
] 3.17ms ± 9% 2.95ms ± 0% -6.86%
(p=0.015 n=20+16)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/2097152/1/1 [polls/iter:0
] 1.59ms ± 9% 1.48ms ± 0% -7.01%
(p=0.000 n=20+16)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/2097152/2/1 [polls/iter:0
] 3.17ms ± 9% 2.95ms ± 0% -6.91%
(p=0.004 n=20+16)
BM_StreamingPingPongWithCoalescingApi<InProcess, NoOpMutator,
NoOpMutator>/134217728/2/1 [polls/iter:0
] 512ms ± 2% 509ms ± 2% -0.74%
(p=0.040 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/0/1/0 [polls/iter:0
] 8.07µs ± 1% 8.02µs ± 1% -0.62%
(p=0.001 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/0/2/0 [polls/iter:0
] 10.9µs ± 1% 10.9µs ± 1% +0.30%
(p=0.014 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/1/1/0 [polls/iter:0
] 8.27µs ± 1% 8.24µs ± 1% -0.40%
(p=0.040 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/1/1/1 [polls/iter:0
] 7.86µs ± 1% 7.83µs ± 1% -0.36%
(p=0.041 n=20+19)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/1/2/1 [polls/iter:0
] 11.0µs ± 1% 10.9µs ± 1% -0.50%
(p=0.000 n=18+19)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/8/2/1 [polls/iter:0
] 10.9µs ± 1% 10.9µs ± 1% +0.28%
(p=0.005 n=17+19)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/64/1/0 [polls/iter:0
] 8.43µs ± 1% 8.40µs ± 1% -0.40%
(p=0.012 n=20+18)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/64/2/1 [polls/iter:0
] 11.2µs ± 1% 11.1µs ± 1% -0.42%
(p=0.019 n=20+18)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/512/1/0 [polls/iter:0
] 8.77µs ± 1% 8.70µs ± 1% -0.91%
(p=0.000 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/512/2/0 [polls/iter:0
] 12.2µs ± 1% 12.1µs ± 1% -0.71%
(p=0.000 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/512/2/1 [polls/iter:0
] 11.8µs ± 1% 11.7µs ± 1% -0.78%
(p=0.000 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/4096/1/0 [polls/iter:0
] 11.0µs ± 1% 11.0µs ± 1% -0.42%
(p=0.030 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/32768/1/1 [polls/iter:0
] 29.4µs ± 1% 29.5µs ± 1% +0.35%
(p=0.003 n=20+20)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/2097152/1/0 [polls/iter:0
] 1.60ms ± 8% 1.48ms ± 1% -7.63%
(p=0.002 n=20+16)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/2097152/2/0 [polls/iter:0
] 3.20ms ± 8% 2.96ms ± 1% -7.49%
(p=0.020 n=20+16)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/2097152/1/1 [polls/iter:0
] 1.60ms ± 8% 1.48ms ± 1% -7.68%
(p=0.000 n=20+16)
BM_StreamingPingPongWithCoalescingApi<MinInProcess, NoOpMutator,
NoOpMutator>/2097152/2/1 [polls/iter:0
] 3.20ms ± 9% 2.95ms ± 1% -7.76%
(p=0.001 n=20+16)
BM_StreamingPingPongWithCoalescingApi<MinInProcessCHTTP2, NoOpMutator,
NoOpMutator>/134217728/1/0 [polls/iter:5.8 writes/iter:9.8
] 255ms ± 2% 248ms ± 1% -2.59%
(p=0.017 n=3+7)
BM_StreamingPingPongWithCoalescingApi<MinInProcessCHTTP2, NoOpMutator,
NoOpMutator>/134217728/2/1 [polls/iter:9.5 writes/iter:18.5
] 523ms ± 1% 512ms ± 2% -2.09%
(p=0.016 n=5+5)
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6 years ago |