$ ./wrk -t4 -d30s -c100 -R100 http://myhost
Running 30s test @ http://myhost
4 threads and 100 connections
Thread calibration: mean lat.: 189.007ms, rate sampling interval: 647ms
Thread calibration: mean lat.: 341.843ms, rate sampling interval: 904ms
Thread calibration: mean lat.: 336.302ms, rate sampling interval: 892ms
Thread calibration: mean lat.: 343.629ms, rate sampling interval: 894ms
Thread Stats Avg Stdev Max +/- Stdev
Latency 315.79ms 115.94ms 506.88ms 53.75%
Req/Sec 24.92 10.10 38.00 70.83%
2975 requests in 30.13s, 825.10KB read
Requests/sec: 98.74
Transfer/sec: 27.39KB
8 threads:
$ ./wrk -t8 -d30s -c100 -R100 http://myhost
Running 30s test @ http://myhost
8 threads and 100 connections
Thread calibration: mean lat.: 323.346ms, rate sampling interval: 902ms
Thread calibration: mean lat.: 321.696ms, rate sampling interval: 901ms
Thread calibration: mean lat.: 329.348ms, rate sampling interval: 895ms
Thread calibration: mean lat.: 324.543ms, rate sampling interval: 912ms
Thread calibration: mean lat.: 324.012ms, rate sampling interval: 907ms
Thread calibration: mean lat.: 330.061ms, rate sampling interval: 910ms
Thread calibration: mean lat.: 332.053ms, rate sampling interval: 914ms
Thread calibration: mean lat.: 333.218ms, rate sampling interval: 910ms
Thread Stats Avg Stdev Max +/- Stdev
Latency 335.85ms 129.11ms 488.96ms 79.56%
Req/Sec 12.25 1.72 16.00 86.05%
2994 requests in 30.06s, 830.37KB read
Requests/sec: 99.59
Transfer/sec: 27.62KB
I get similar results when I run the test for longer (5 mins). I observe the same latencies as measured by the server, so I wonder is there something different with the way multi-threaded load is generated?
Hi there,
I'm trying to understand why I would be seeing a jump in latency when the thread count is greater than 1.
On an c5.2xlarge ec2 instance with 4 physical CPUs (8 logical)
1 thread:
4 threads:
8 threads:
I get similar results when I run the test for longer (5 mins). I observe the same latencies as measured by the server, so I wonder is there something different with the way multi-threaded load is generated?