Asri-unix.465
net.unix-wizards
utzoo!decvax!ucbvax!menlo70!sri-unix!mclure@SRI-UNIX
Thu Jan 7 23:17:46 1982
query about multiple block write efficiency
I have a question about write()ing in multiples of BUFSIZ chars vs.
write()ing in gigantic chunks. How much of a difference does it make?
The program takes text from one file such as:
text1: 400 chars
text2: 1005 chars
text3: 15332 chars
text4: 566 chars
text5: 712 chars
etc.
and must write out text1, text3 and text5 to another file most efficently
(and quickly). My current scheme simply has a gigantic 10*BUFSIZ char array
and each textN is read into the array (the text all comes from a file) and
then write()s out to the other file. How much more efficient would it be to
guarantee that each write produces a multiple of BUFSIZ? Would this produce
a noticeable speedup? We're on an 11/70 running the Berkeley Software
Distribution.
Has anyone done any studies on this?
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