Ruby GC settings wrapper: http://thefjord.org/2010/05/24/default-gc-parameters-for-ruby-enterprise-edition/

ruby.c

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>

int main(int argc, char* argv[]) {
	setenv("RUBY_HEAP_MIN_SLOTS", "650000", 0);
	setenv("RUBY_GC_MALLOC_LIMIT", "50000000", 0);

	// Optional GC logging
	//setenv("RUBY_GC_STATS", "1", 0);
	//char log[100];
	//snprintf(log, 100, "/tmp/ruby_gc_%d.txt", getpid());
	//setenv("RUBY_GC_DATA_FILE", log, 0);

	execv("/opt/ruby-enterprise-1.8.7-nnn/bin/ruby.real", argv);
	fprintf(stderr, "Ruby Wrapper: error starting real ruby: %s\n", strerror(errno));
	return(EXIT_FAILURE);
}