krasic@tucana.mpr.ca (Charles Krasic) (05/25/91)
I'm writing a program which needs to read a chunk of data
directly into memory and I'm having trouble deciding what is the
_best_ way to do it. I've been considering three possibilities:
1) mmap the chunk of the file into memory with
flags set to MAP_PRIVATE
2) malloc a chunk of memory and use either
i) fread
or ii) fgetc
Any of these should work (I think...) but I would like to know
which is best.
--
Charles Krasic | Voice : (604) 294-1471
MPR Teltech Ltd. | Fax : (604) 293-5787
8999 Nelson Way, Burnaby, BC | E-Mail: krasic@mprgate.mpr.ca
Canada, V5A 4B5 | mprgate.mpr.ca!krasic@uunet.uu.neticsu7039@ming.cs.montana.edu (Spannring) (05/31/91)
In article <KRASIC.91May24165634@tucana.mpr.ca> krasic@tucana.mpr.ca (Charles Krasic) writes: [ lines about wanting to bring a chunk of a binary file into memory deleted ] > > 1) mmap the chunk of the file into memory with > flags set to MAP_PRIVATE I've never heard of mmap before and our man pages haven't either. I would guess it isn't portable, so I'd avoid it. > 2) malloc a chunk of memory and use either > i) fread Probaly not too bad, but if you are bringing in big (>=512 bytes) chunks of data, why not go directly to the system calls and use read? Should be about as fast as you can get. > or ii) fgetc I would guess somewhat slow. -- ==================================================================== Six of one, 110 (base 2) of | Craig Spannring another. | icsu7039@caesar.cs.montana.edu ----------------------------------+--------------------------------