I am working on prototyping a video game. I have a function `state->pict`
that takes a game state and creates a pict to be drawn on a canvas. When I
`time` this function I get nice low numbers like "cpu time: 0 real time: 2
gc time: 0"
The problem occurs when I am running a networked multiplayer game. The size
and complexity of the state remains the same (a "state" represents only one
player's state). But the mere presence of other threads doing network IO
somehow slows down `state->pict` which is strange because it is a pure
function. I get timing results like "cpu time: 78 real time: 71 gc time:
0". If I stop the network activity mid-game, after a few seconds it will
start running quickly again.
This makes me think that other threads are interrupting state->pict and
that this interruption is being captured by `time`. Is that plausible?
Do I need to use a separate place for the network request/response queue?
Right now, I am just using `thread` like this:
; (-> request (evtof response))
(define/public (sendrq rq)
(let ([result (box #f)])
(wrap-evt (thread (lambda () (set-box! result (send/recv rq))))
(lambda args (unbox result)))))
There is one other area that concerns me: I am using `read` on the
input-port returned by `tcp-connect`. I was hoping that `read` would yield
while it is waiting for the datum to arrive on the port, but maybe it spins
instead which would explain the elevated CPU usage.
I tried `raco profile my-game.rkt` but that only profiles the time it takes
to show the initial frame. Is there some other technique I can use to
profile the game while it is running?
Thanks in advance for any suggestions.
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