Hi. I've released timeplot on hackage: http://hackage.haskell.org/package/timeplot Timeplot is a program for visualizing time series from log files. The typical usage scenario: - Take a big log file of your program (100k-1m lines is OK) - Preprocess it with an awk one-liner to obtain a trace for timeplot - Plot the trace with timeplot, telling it which chart type (one of 8) to use for each "track" of the trace. For example, you can plot the frequencies of response times falling into 0..100ms, 100..500ms, 500..1000ms and >1000ms over 5-minute time intervals, or plot their 25% and 50% quantiles. - Behold the resulting graphics and discover anomalies and interesting process interdependencies in your program. Take a look at the description with lots of pretty pictures and a tutorial: http://www.haskell.org/haskellwiki/Timeplot -- Eugene Kirpichov Web IR developer, market.yandex.ru