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* [9fans] little pipe speedtest
@ 2022-06-04 15:15 ori
  0 siblings, 0 replies; only message in thread
From: ori @ 2022-06-04 15:15 UTC (permalink / raw)
  To: 9fans

inspired by:

        https://mazzo.li/posts/fast-pipes.html

I was curious to see how things stacked up on plan 9.

The machines are apples to oranges (my 9front box
is a 2015-ish era Zbox with a Intel Core i5-7300HQ
processor, and my work machine is a Linux with a
12 core Ryzen 9 3900X).

Transferring 128 gigs instead of the 10 in the initial
benchmark, here are the results:
        
        # 9front 595684fd8a2f08e12d5df48152d93fb8ab800fe3 amd64
        % time rc -c '6.write | 6.read'
        0.33u 23.28s 11.64r      rc -c 6.write | 6.read 
        
        # Linux 5.13.0-40-generic #45~20.04.1-Ubuntu SMP
        $ time sh -c './write | ./read'
        real    0m32.039s
        user    0m0.231s
        sys     0m34.576s

here's the plan 9 version of the program:

        write.c:
                #include <u.h>
                #include <libc.h>
                
                void
                main(void)
                {
                        usize sz;
                        char* buf;
                
                        sz = 1 << 18;
                        buf = malloc(sz);
                        memset((void*)buf, 'X', sz);
                        while(1){
                                n = write(1, buf, sz) != sz)
                                        break;
                        exits(nil);
                }

        read.c:
                #include <u.h>
                #include <libc.h>
                
                enum {
                        KiB = 1024ULL,
                        MiB = 1024*KiB,
                        GiB = 1024*MiB,
                };
                
                void
                main(void)
                {
                        vlong sz, r, n;
                        char* buf;
                
                        r = 0;
                        sz = 1 << 18;
                        buf = malloc(sz);
                        while(r <= 128ULL*GiB){
                                n = read(0, buf, sz);
                                if(n <= 0)
                                        break;
                                r += n;
                        }
                        exits(nil);
                }

And the linux version:

        write.c:
                #include <stdlib.h>
                #include <unistd.h>
                #include <string.h>
                
                int
                main(int argc, char **argv)
                {
                        size_t sz;
                        char* buf;
                
                        sz = 1 << 18;
                        buf = malloc(sz);
                        memset(buf, 'X', sz);
                        while(1)
                                if(write(1, buf, sz) != sz)
                                        break;
                
                        return 0;
                }
        read.c:
                #include <stdlib.h>
                #include <unistd.h>
                
                enum {
                        KiB = 1024ULL,
                        MiB = 1024*KiB,
                        GiB = 1024*MiB,
                };
                
                int
                main(int argc, char **argv)
                {
                        ssize_t sz, r, n;
                        char* buf;
                
                        r = 0;
                        sz = 1 << 18;
                        buf = malloc(sz);
                        while(r <= 128ULL*GiB){
                                n = read(0, buf, sz);
                                if(n <= 0)
                                        break;
                                r += n;
                        }
                        return 0;
                }


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