示例
exec
您可以使用 exec 探测器轻松地确定正在执行哪些程序以及由哪个用户执行，如下例所示：
#pragma D option quiet
proc:::exec
{
self->parent = execname;
}
proc:::exec-success
/self->parent != NULL/
{
@[self->parent, execname] = count();
self->parent = NULL;
}
proc:::exec-failure
/self->parent != NULL/
{
self->parent = NULL;
}
END
{
printf("%-20s %-20s %s\n", "WHO", "WHAT", "COUNT");
printa("%-20s %-20s %@d\n", @);
}
在生成计算机上运行示例脚本一段时间后将产生与以下示例类似的输出：
# dtrace -s ./whoexec.d ^C WHO WHAT COUNT make.bin yacc 1 tcsh make 1 make.bin spec2map 1 sh grep 1 lint lint2 1 sh lint 1 sh ln 1 cc ld 1 make.bin cc 1 lint lint1 1 sh lex 1 make.bin mv 2 sh sh 3 sh make 3 sh sed 4 sh tr 4 make make.bin 4 sh install.bin 5 sh rm 6 cc ir2hf 33 cc ube 33 sh date 34 sh mcs 34 cc acomp 34 sh cc 34 sh basename 34 basename expr 34 make.bin sh 87 |
start 和 exit
如果要知道程序从创建到终止所运行的时间，可以启用 start 和 exit 探测器，如下例所示：
proc:::start
{
self->start = timestamp;
}
proc:::exit
/self->start/
{
@[execname] = quantize(timestamp - self->start);
self->start = 0;
}
在生成服务器上运行示例脚本几秒钟后将产生与以下示例类似的输出：
# dtrace -s ./progtime.d
dtrace: script './progtime.d' matched 2 probes
^C
ir2hf
value ------------- Distribution ------------- count
4194304 | 0
8388608 |@ 1
16777216 |@@@@@@@@@@@@@@@@ 14
33554432 |@@@@@@@@@@ 9
67108864 |@@@ 3
134217728 |@ 1
268435456 |@@@@ 4
536870912 |@ 1
1073741824 | 0
ube
value ------------- Distribution ------------- count
16777216 | 0
33554432 |@@@@@@@ 6
67108864 |@@@ 3
134217728 |@@ 2
268435456 |@@@@ 4
536870912 |@@@@@@@@@@@@ 10
1073741824 |@@@@@@@ 6
2147483648 |@@ 2
4294967296 | 0
acomp
value ------------- Distribution ------------- count
8388608 | 0
16777216 |@@ 2
33554432 | 0
67108864 |@ 1
134217728 |@@@ 3
268435456 | 0
536870912 |@@@@@ 5
1073741824 |@@@@@@@@@@@@@@@@@@@@@@@@@ 22
2147483648 |@ 1
4294967296 | 0
cc
value ------------- Distribution ------------- count
33554432 | 0
67108864 |@@@ 3
134217728 |@ 1
268435456 | 0
536870912 |@@@@ 4
1073741824 |@@@@@@@@@@@@@@ 13
2147483648 |@@@@@@@@@@@@ 11
4294967296 |@@@ 3
8589934592 | 0
sh
value ------------- Distribution ------------- count
262144 | 0
524288 |@ 5
1048576 |@@@@@@@ 29
2097152 | 0
4194304 | 0
8388608 |@@@ 12
16777216 |@@ 9
33554432 |@@ 9
67108864 |@@ 8
134217728 |@ 7
268435456 |@@@@@ 20
536870912 |@@@@@@ 26
1073741824 |@@@ 14
2147483648 |@@ 11
4294967296 | 3
8589934592 | 1
17179869184 | 0
make.bin
value ------------- Distribution ------------- count
16777216 | 0
33554432 |@ 1
67108864 |@ 1
134217728 |@@ 2
268435456 | 0
536870912 |@@ 2
1073741824 |@@@@@@@@@ 9
2147483648 |@@@@@@@@@@@@@@@ 14
4294967296 |@@@@@@ 6
8589934592 |@@ 2
17179869184 | 0
|
lwp-start 和 lwp-exit
您可能不需要知道特定进程运行的时间，而需要知道各个线程运行的时间。以下示例说明了如何将 lwp-start 和 lwp-exit 探测器用于此目的：
proc:::lwp-start
/tid != 1/
{
self->start = timestamp;
}
proc:::lwp-exit
/self->start/
{
@[execname] = quantize(timestamp - self->start);
self->start = 0;
}
在 NFS（网络文件系统）和日历服务器上运行示例脚本将产生与以下示例类似的输出：
# dtrace -s ./lwptime.d
dtrace: script './lwptime.d' matched 3 probes
^C
nscd
value ------------- Distribution ------------- count
131072 | 0
262144 |@ 18
524288 |@@ 24
1048576 |@@@@@@@ 75
2097152 |@@@@@@@@@@@@@@@@@@@@@@@ 245
4194304 |@@ 22
8388608 |@@ 24
16777216 | 6
33554432 | 3
67108864 | 1
134217728 | 1
268435456 | 0
mountd
value ------------- Distribution ------------- count
524288 | 0
1048576 |@ 15
2097152 |@ 24
4194304 |@@@ 51
8388608 |@ 17
16777216 |@ 24
33554432 |@ 15
67108864 |@@@@ 57
134217728 |@ 28
268435456 |@ 26
536870912 |@@ 39
1073741824 |@@@ 45
2147483648 |@@@@@ 72
4294967296 |@@@@@ 77
8589934592 |@@@ 55
17179869184 | 14
34359738368 | 2
68719476736 | 0
automountd
value ------------- Distribution ------------- count
1048576 | 0
2097152 | 3
4194304 |@@@@ 146
8388608 | 6
16777216 | 6
33554432 | 9
67108864 |@@@@@ 203
134217728 |@@ 87
268435456 |@@@@@@@@@@@@@@@ 534
536870912 |@@@@@@ 223
1073741824 |@ 45
2147483648 | 20
4294967296 | 26
8589934592 | 20
17179869184 | 19
34359738368 | 7
68719476736 | 2
137438953472 | 0
iCald
value ------------- Distribution ------------- count
8388608 | 0
16777216 |@@@@@@@ 20
33554432 |@@@ 9
67108864 |@@ 8
134217728 |@@@@@ 16
268435456 |@@@@ 11
536870912 |@@@@ 11
1073741824 |@ 4
2147483648 | 2
4294967296 | 0
8589934592 |@@ 8
17179869184 |@ 5
34359738368 |@ 4
68719476736 |@@ 6
137438953472 |@ 4
274877906944 | 2
549755813888 | 0
|
signal-send
您可以使用 signal-send 探测器确定与任何信号关联的发送和接收进程，如下例所示：
#pragma D option quiet
proc:::signal-send
{
@[execname, stringof(args[1]->pr_fname), args[2]] = count();
}
END
{
printf("%20s %20s %12s %s\n",
"SENDER", "RECIPIENT", "SIG", "COUNT");
printa("%20s %20s %12d %@d\n", @);
}
运行此脚本将会生成与以下示例类似的输出：
# dtrace -s ./sig.d
^C
SENDER RECIPIENT SIG COUNT
xterm dtrace 2 1
xterm soffice.bin 2 1
tr init 18 1
sched test 18 1
sched fvwm2 18 1
bash bash 20 1
sed init 18 2
sched ksh 18 15
sched Xsun 22 471
|
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