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7.21 Usage

Function: statprof-active?

Returns #t if statprof-start has been called more times than statprof-stop, #f otherwise.

Function: statprof-start

Start the profiler.

Function: statprof-stop

Stop the profiler.

Function: statprof-reset sample-seconds sample-microseconds count-calls? [full-stacks?]

Reset the statprof sampler interval to sample-seconds and sample-microseconds. If count-calls? is true, arrange to instrument procedure calls as well as collecting statistical profiling data. If full-stacks? is true, collect all sampled stacks into a list for later analysis.

Enables traps and debugging as necessary.

Function: statprof-accumulated-time

Returns the time accumulated during the last statprof run.

Function: statprof-sample-count

Returns the number of samples taken during the last statprof run.

Function: statprof-fold-call-data proc init

Fold proc over the call-data accumulated by statprof. Cannot be called while statprof is active. proc should take two arguments, (call-data prior-result).

Note that a given proc-name may appear multiple times, but if it does, it represents different functions with the same name.

Function: statprof-proc-call-data proc

Returns the call-data associated with proc, or #f if none is available.

Function: statprof-call-data-name cd

Function: statprof-call-data-calls cd

Function: statprof-call-data-cum-samples cd

Function: statprof-call-data-self-samples cd

Function: statprof-call-data->stats call-data

Returns an object of type statprof-stats.

Function: statprof-stats-proc-name stats

Function: statprof-stats-%-time-in-proc stats

Function: statprof-stats-cum-secs-in-proc stats

Function: statprof-stats-self-secs-in-proc stats

Function: statprof-stats-calls stats

Function: statprof-stats-self-secs-per-call stats

Function: statprof-stats-cum-secs-per-call stats

Function: statprof-display . _

Displays a gprof-like summary of the statistics collected. Unless an optional port argument is passed, uses the current output port.

Function: statprof-display-anomolies

A sanity check that attempts to detect anomolies in statprof’s statistics.

Function: statprof-fetch-stacks

Returns a list of stacks, as they were captured since the last call to statprof-reset.

Note that stacks are only collected if the full-stacks? argument to statprof-reset is true.

Function: statprof-fetch-call-tree
Return a call tree for the previous statprof run.

The return value is a list of nodes, each of which is of the type:
@@code
 node ::= (@@var@{proc@} @@var@{count@} . @@var@{nodes@})
@@end code

Function: statprof thunk [#:loop] [#:hz] [#:count-calls?] [#:full-stacks?]

Profiles the execution of thunk.

The stack will be sampled hz times per second, and the thunk itself will be called loop times.

If count-calls? is true, all procedure calls will be recorded. This operation is somewhat expensive.

If full-stacks? is true, at each sample, statprof will store away the whole call tree, for later analysis. Use statprof-fetch-stacks or statprof-fetch-call-tree to retrieve the last-stored stacks.

Special Form: with-statprof args

Profiles the expressions in its body.

Keyword arguments:

#:loop

Execute the body loop number of times, or #f for no looping

default: #f

#:hz

Sampling rate

default: 20

#:count-calls?

Whether to instrument each function call (expensive)

default: #f

#:full-stacks?

Whether to collect away all sampled stacks into a list

default: #f

Function: gcprof thunk [#:loop] [#:full-stacks?]

Do an allocation profile of the execution of thunk.

The stack will be sampled soon after every garbage collection, yielding an approximate idea of what is causing allocation in your program.

Since GC does not occur very frequently, you may need to use the loop parameter, to cause thunk to be called loop times.

If full-stacks? is true, at each sample, statprof will store away the whole call tree, for later analysis. Use statprof-fetch-stacks or statprof-fetch-call-tree to retrieve the last-stored stacks.


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