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Re: Where reading files into ZWEI spends its time.
- To: RMS at MIT-AI, (BUG ZWEI) at MIT-AI
- Subject: Re: Where reading files into ZWEI spends its time.
- From: MOON@MIT-MC
- Date: Thu ,20 Jul 79 09:50:27 EDT
- Cc: HIC at MIT-MC
The time spent inside the LINE-IN operation of the file stream, about half
of the total, breaks down roughly as follows:
1/3 in STRING-SEARCH-CHAR looking for a carriage return
1/3 in FILE-NEXT-READ-PKT, of which
almost 1/2 CHAOS:GET-NEXT-PKT
almost 1/2 TV-WHO-LINE-UPDATE
(This is somewhat inflated since there were who-line
updates due to my typing the commands to read the file.)
1/3 elsewhere (generally just executing code.)
1/10 of the total is in ADJUST-ARRAY-SIZE, which is a fairly
I changed it to open-code the STRING-SEARCH-CHAR, not calling CHAR-EQUAL
since it's using 8-bit characters and not searching for a letter. It's hard
to measure the difference but I think it cut out only about 1/2 of the time
that was spent searching for the CR. I haven't tried to do anything about
the who-line update yet.
This code (in QFILE) could probably use a bit more attention.
The 1/6 of the time spent in the Chaos net is probably reasonable.
To help with these measurements I'm writing a little (teensy) timing
package. It will be in AI:MOON;LMTIME (it isn't done yet, and I don't
guarantee to leave it in working condition.)
RMS@MIT-AI 07/20/79 01:11:04 Re: Where reading files into ZWEI spends its time.
To: (BUG ZWEI) at MIT-AI
These statistics apply to reading in LMIO;CHSNCP.
The largest share is spent inside the chaos stream: 27 seconds.
The next largest goes to sectionizing. It takes about 20 seconds
but this time increases with the amount of data in the editor.
Doing the interns takes 6 seconds, but swaps in enough to delay
other things another 4 seconds or so. Merging the arrays adds another 10.
Removing the old definitions for this buffer takes another 2 or so.
The ZWEI interval-stream takes only about 2 seconds to store the lines.
It takes about 4 seconds to open the file, maybe 2 to close it.
Grand total: about 1 minute.