CODEWITHSUNDEEP
cunix
user2777922
user2777922

Reputation: 21

Micro-managing memory usage for C process

I wanted to implement memory management functions using C. The situation is like.. Total size of physical memory is 256mb.

How can I allocate 128mb to one process 64mb to other process.

I want to implement best fit algorithm using freelist & needs to do compaction.
Can anybody help me in this regard, or suggest any book for studying the same?

Upvotes: 2

Views: 166

Answers (1)

Sergey L.
Sergey L.

Reputation: 22562

You can set the maximum amount of memory a process can use (Resident Set) with 

ulimit -m 131072

for example to limit all forked processes from your shell to 128mb of maximum resident set.

Or in C via

#include <sys/time.h>
#include <sys/resource.h>
int setrlimit(int resource, const struct rlimit *rlim);

e.g.

struct rlimit rlim;
getrlimit(RLIMIT_RSS, &rlim);
rlim.rlim_cur = (128 << 20) / sysconf(_SC_PAGESIZE) // 128 MiB
setrlimit(RLIMIT_RSS, &rlim);

Upvotes: 2

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