1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0+
3 #
4 # Analyze a given results directory for rcuscale scalability measurements.
5 #
6 # Usage: kvm-recheck-rcuscale.sh resdir
7 #
8 # Copyright (C) IBM Corporation, 2016
9 #
10 # Authors: Paul E. McKenney <paulmck@linux.ibm.com>
11
12 i="$1"
13 if test -d "$i" -a -r "$i"
14 then
15 :
16 else
17 echo Unreadable results directory: $i
18 exit 1
19 fi
20 PATH=`pwd`/tools/testing/selftests/rcutorture/bin:$PATH; export PATH
21 . functions.sh
22
23 if kvm-recheck-rcuscale-ftrace.sh $i
24 then
25 # ftrace data was successfully analyzed, call it good!
26 exit 0
27 fi
28
29 configfile=`echo $i | sed -e 's/^.*\///'`
30
31 sed -e 's/^\[[^]]*]//' < $i/console.log |
32 awk '
33 /-scale: .* gps: .* batches:/ {
34 ngps = $9;
35 nbatches = 1;
36 }
37
38 /-scale: .*writer-duration/ {
39 gptimes[++n] = $5 / 1000.;
40 sum += $5 / 1000.;
41 }
42
43 /rcu_scale: Grace-period kthread CPU time/ {
44 cputime = $6;
45 }
46
47 END {
48 newNR = asort(gptimes);
49 if (newNR <= 0) {
50 print "No rcuscale records found???"
51 exit;
52 }
53 pct50 = int(newNR * 50 / 100);
54 if (pct50 < 1)
55 pct50 = 1;
56 pct90 = int(newNR * 90 / 100);
57 if (pct90 < 1)
58 pct90 = 1;
59 pct99 = int(newNR * 99 / 100);
60 if (pct99 < 1)
61 pct99 = 1;
62 div = 10 ** int(log(gptimes[pct90]) / log(10) + .5) / 100;
63 print "Histogram bucket size: " div;
64 last = gptimes[1] - 10;
65 count = 0;
66 for (i = 1; i <= newNR; i++) {
67 current = div * int(gptimes[i] / div);
68 if (last == current) {
69 count++;
70 } else {
71 if (count > 0)
72 print last, count;
73 count = 1;
74 last = current;
75 }
76 }
77 if (count > 0)
78 print last, count;
79 print "Average grace-period duration: " sum / newNR " microseconds";
80 print "Minimum grace-period duration: " gptimes[1];
81 print "50th percentile grace-period duration: " gptimes[pct50];
82 print "90th percentile grace-period duration: " gptimes[pct90];
83 print "99th percentile grace-period duration: " gptimes[pct99];
84 print "Maximum grace-period duration: " gptimes[newNR];
85 if (cputime != "")
86 cpustr = " CPU: " cputime;
87 print "Grace periods: " ngps + 0 " Batches: " nbatches + 0 " Ratio: " ngps / nbatches cpustr;
88 print "Computed from rcuscale printk output.";
89 }'
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