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20 hours ago •
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CDN trace expected behavior
Hi, I ran cdn/202303/ trace according instruction here https://cachelib.org/docs/Cache_Library_User_Guides/Cachebench_FB_HW_eval/.
The problem is that it seems never to finish even though I changed the config to "numOps": 50000. Is this expected behavior? I
The command I used is
opt/cachelib/bin/cachebench --json_test_config cdn_trace_reag0c01_20230315_20230322.json \
--progress_stats_file cdn-trace-progress.log \
--report_ac_memory_usage_stats human_readable \
--report_api_latenc
Here's my config.
{
"cache_config": {
"allocator": "LRU2Q",
"cacheSizeMB": 2857,
"htBucketPower": 24,
"htLockPower": 10,
"allocSizes": [
128,
216,
232,
248,
272,
296,
320,
496,
536,
768,
824,
1024,
1096,
1176,
1264,
1352,
1448,
1552,
1664,
1784,
1912,
2048,
2192,
2352,
2520,
2696,
2888,
3096,
3312,
3544,
3792,
4064,
4352,
4656,
4984,
5336,
5712,
6112,
6544,
7008,
7504,
8032,
8600,
9208,
9856,
10552,
11296,
12088,
12936,
13848,
14824,
15864,
16976,
18168,
19440,
20800,
22256,
23816,
25488,
27272,
29184,
31232,
38272,
40952,
43824,
46896,
50184,
53696,
57456,
61480,
65848,
70392,
75320,
80592,
86240,
92280,
98744,
105656,
113056,
120976,
129448,
138512,
148208,
158584,
169688,
181568,
194280,
207880,
222432,
238008,
254672,
272504,
291584,
312000,
333840,
357208,
382216,
408976,
437608,
468240,
501016,
655360,
786432,
917504,
1048576,
1572864,
2097152,
2621440,
3145728,
3670016,
4194304
],
"numPools": 1,
"poolSizes": [
1.0
],
"__nvmCacheSizeMB": 129619,
"__nvmCachePaths": [],
"navyBlockSize": 4096,
"navySegmentedFifoSegmentRatio": [
1,
1,
1
],
"navyReqOrderShardsPower": 0,
"navyBigHashSizePct": 0,
"navyHitsReinsertionThreshold": 1,
"navyProbabilityReinsertionThreshold": 0,
"navyReaderThreads": 128,
"navyWriterThreads": 128,
"navyCleanRegions": 6,
"navyNumInmemBuffers": 6,
"navyParcelMemoryMB": 65536,
"navyDataChecksum": false,
"lru2qHotPct": 20,
"lru2qColdPct": 20,
"truncateItemToOriginalAllocSizeInNvm": true,
"memoryOnlyTTL": 7200,
"navyRegionSizeMB": 256,
"printNvmCounters": true,
"useTraceTimeStamp": true,
"tickerSynchingSeconds": 600.0
},
"test_config": {
"enableLookaside": false,
"generator": "piecewise-replay",
"___numOps": 1000000000,
"numOps": 50000,
"numThreads": 24,
"populateItem": true,
"prepopulateCache": false,
"traceFileName": "reag0c01_20230315_20230322_0.2000.csv",
"replayGeneratorConfig": {
"numAggregationFields": 3,
"numExtraFields": 0,
"statsPerAggField": {}
},
"cachePieceSize": 65536
}
}
output is like this
Welcome to OSS version of cachebench
I0328 01:34:25.561690 40718 ReplayGeneratorBase.h:218] [0] Opened trace file reag0c01_20230315_20230322_0.2000.csv
Total 1.20M ops to be run
E0328 01:34:25.624919 40722 TimeStampTicker.cpp:57] A thread is trying to update too many buckets at one time: 0 to 2798105
E0328 01:34:25.624946 40724 TimeStampTicker.cpp:57] A thread is trying to update too many buckets at one time: 0 to 2798105
01:34:25 0.00M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
== PieceWiseReplayGenerator Stats in Recent Time Window (1678863569 - 1678863601) ==
Total Processed Samples: 0.00 million
getBytes : 0.48 GB, getBytesPerSec : 0.00 GB/s, success : 4.01%, full success: 4.00%
getBodyBytes: 0.48 GB, getBodyBytesPerSec: 0.00 GB/s, success : 3.97%, full success: 3.97%
egressBytes : 0.48 GB, ingressBytes: 0.43 GB, egressBytesPerSec : 0.00 GB/s, ingressBytesPerSec: 0.00 GB/s, ingressEgressratio: 11.80%
objectGet : 706, objectGetPerSec : 1 /s, success : 37.11%, full success: 33.14%
== PieceWiseReplayGenerator Stats in Recent Time Window (1678863600 - 1678864202) ==
Total Processed Samples: 0.04 million
getBytes : 19.70 GB, getBytesPerSec : 0.03 GB/s, success : 22.67%, full success: 22.24%
getBodyBytes: 19.66 GB, getBodyBytesPerSec: 0.03 GB/s, success : 22.63%, full success: 22.22%
egressBytes : 19.68 GB, ingressBytes: 15.28 GB, egressBytesPerSec : 0.03 GB/s, ingressBytesPerSec: 0.03 GB/s, ingressEgressratio: 22.37%
objectGet : 36,940, objectGetPerSec : 61 /s, success : 51.39%, full success: 41.07%
I0328 01:34:26.649105 40718 PieceWiseReplayGenerator.cpp:271] Thread 15 finish, skip
01:35:25 0.79M ops completed. Hit Ratio 82.75% (RAM 82.75%, NVM 0.00%)
01:36:25 0.79M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
01:37:25 0.79M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
01:38:25 0.79M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
01:39:25 0.79M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
01:40:25 0.79M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
01:41:25 0.79M ops completed. Hit Ratio 0.00% (RAM 0.00%, NVM 0.00%)
Hi, you can bypass this by changing "tickerSynchingSeconds" to 0 (or remove it from your cachebench config).
There is a known issue in ticker syncing that sometimes would cause the trace consumption to hang.
