Usage: ./callgrind-splitter <input-file> <output-prefix>
This script will split a series of concatenated callgrind files back into the original callgrind files.
It is especially useful when extracting profiling information obtained using the
scalyr agent's profiling feature because the agent will upload each run of the
profiler under the same logfile name agent.callgrind.
This means that if you use something like the scalyr-tool to download the profiling information, it is likely that the downloaded file will contain multiple callgrind files that were each output during the time interval of interest.
For example, say a customer has turned on profiling for their agents, and we want to obtain the profiles from a specific serverHost. You would run the scalyr tool with the following options to get the profiling data from that serverHost over the previous 24h:
./scalyr download-log --serverHost --logfile agent.callgrind --start 24h > agent.callgrind
Then you could use callgrind-splitter to split that out in to multiple files,
each prefixed with agent-:
./callgrind-splitter agent.callgrind agent-
If the original agent.callgrind file contained 4 different profiling runs the
output will be split into agent-01.callgrind, agent-02.callgrind,
agent-03.callgrind and agent-04.callgrind.
Each of these can then be loaded in a program that allows you to view callgrind files.
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