1 This is a demonstration of the dispqlen.d script, 2 3 4 Here we run it on a single CPU desktop, 5 6 # dispqlen.d 7 Sampling... Hit Ctrl-C to end. 8 ^C 9 CPU 0 10 value ------------- Distribution ------------- count 11 < 0 | 0 12 0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1790 13 1 |@@@ 160 14 2 | 10 15 3 | 0 16 17 The output shows the length of the dispatcher queue is mostly 0. This is 18 evidence that the CPU is not very saturated. It does not indicate that the 19 CPU is idle - as we are measuring the length of the queue, not what is 20 on the CPU. 21 22 23 24 Here it is run on a multi CPU server, 25 26 # dispqlen.d 27 Sampling... Hit Ctrl-C to end. 28 ^C 29 CPU 1 30 value ------------- Distribution ------------- count 31 < 0 | 0 32 0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1573 33 1 |@@@@@@@@@ 436 34 2 | 4 35 3 | 0 36 37 CPU 4 38 value ------------- Distribution ------------- count 39 < 0 | 0 40 0 |@@@@@@@@@@@@@@@@@@@@@@ 1100 41 1 |@@@@@@@@@@@@@@@@@@ 912 42 2 | 1 43 3 | 0 44 45 CPU 0 46 value ------------- Distribution ------------- count 47 < 0 | 0 48 0 |@@@@@@@@@@@@@@@@@ 846 49 1 |@@@@@@@@@@@@@@@@@@@@@@@ 1167 50 2 | 0 51 52 CPU 5 53 value ------------- Distribution ------------- count 54 < 0 | 0 55 0 |@@@@@@@@ 397 56 1 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1537 57 2 |@@ 79 58 3 | 0 59 60 The above output shows that threads are queueing up on CPU 5 much more than 61 CPU 0. 62 63
Indexes created Mon Apr 20 00:23:12 UTC 2026