Understand the dtrace quantize output

[RAMASUBRAMANIAN Srikant]

Hi,



I am kind of new to DTrace , I have written a script to time function calls
in our application library ,



Wanted to know how to interpret the output from quantize of the elapsed time
in each function call , here is a sample



Here is the entry and return function for the library that is being traced



pid$1:libswduar::entry

{

duarEntry[probefunc] = timestamp;

@duarCount[probefunc] = count();

}

pid$1:libswduar::return

{

this->elapsed = (timestamp - duarEntry[probefunc])/1000000;

@totduarTime[probefunc] = quantize(this->elapsed);

duarEntry[probefunc] = 0;

}



LdapSearchRequest



value ------------- Distribution ------------- count

-1 | 0

0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 147

1 | 0

2 | 0

4 | 0

8 | 0

16 | 0

32 | 0

64 | 0

128 | 0

256 | 0

512 | 0

1024 | 0

2048 | 0

4096 | 0

8192 | 0

16384 | 0

32768 | 0

65536 | 0

131072 | 0

262144 | 0

524288 | 0

1048576 | 0

2097152 | 0

4194304 | 0

8388608 | 0

16777216 | 0

33554432 | 0

67108864 | 0

134217728 | 0

268435456 | 0

536870912 | 0

1073741824 | 0

2147483648 |@@@@@ 21

4294967296 | 0



Thanks & Regards

Srikant Ramasubramanian
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