tslat

As of first step to do performance review of your application is look to your log files. But it may be so tedious to calc time delta between two adjacent log lines. This tool is to resquie! It's calculates timestamp delta between to adjacent log lines and out in format you may specify.

Let's suppose we have following log lines in file:

2018-09-21 14:43:59,832 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Get evolution scripts by: META-INF/dbevolution/accounting/.index
2018-09-21 14:43:59,845 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Got evolution files: List(1.sql, 2.sql, 3.sql, 4.sql)
2018-09-21 14:43:59,846 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Found: META-INF/dbevolution/accounting/1.sql
2018-09-21 14:43:59,852 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Found: META-INF/dbevolution/accounting/2.sql

And we want to see time delta between timestamps on each log line. We can estimate performance of each operation on high level, for example. Download and run this nifty tool:

$cat server.log | tslat -delta-format "%9d|" 
        0| 2018-09-21 14:43:59,832 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Get evolution scripts by: META-INF/dbevolution/accounting/.index
       13| 2018-09-21 14:43:59,845 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Got evolution files: List(1.sql, 2.sql, 3.sql, 4.sql)
        1| 2018-09-21 14:43:59,846 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Found: META-INF/dbevolution/accounting/1.sql
        6| 2018-09-21 14:43:59,852 DEBUG [main] r.k.u.d.ClasspathScriptLocator - Found: META-INF/dbevolution/accounting/2.sql

I prefer to separate delta value from the rest of logs by | char, so I added parameter -delta-format. It's simplifies further logs processing by other tools like sed or awk.

help

As usually:

$ tslat --help
Usage of ./tslat:
  -date-length int
        Length of date string from line start (default 23)
  -delta-format string
        Timestamp delta output format in golang Sprinf() syntax (default "%9d")
  -input string
        Input file path. Stdin will be used if its option is ommited
  -threshold int
        Filter out lines with timestamp delta lesser than specified threshold

Note! All time deltas, if not stated others, is treated as microseconds.

lis0x90/tslat

tslat

help