SSD Electronic disk speed detection under Linux

Code:

#include <stdio.h> #include <sys/time.h> #include <fcntl.h> #include <pthread.h> unsigned char    pbuffer[1024*1024*8];//Shared buffer void testssd1 (int *ch)//write test {int i=0;        int FD; if (*ch==0) fd = open ("/ssd1/test.dat", o_rdwr| O_creat); if (*ch==1) fd = open ("/ssd2/test.dat", o_rdwr| O_creat); if (*ch==2) fd = open ("/ssd3/test.dat", o_rdwr| O_creat); if (*ch==3) fd = open ("/ssd4/test.dat", o_rdwr| O_creat); if (*ch==4) fd = open ("/ssd5/test.dat", o_rdwr| O_creat); if (*ch==5) fd = open ("/ssd6/test.dat", o_rdwr| O_creat); if (*ch==6) fd = open ("/ssd7/test.dat", o_rdwr| O_creat); if (*ch==7) fd = open ("/ssd8/test.dat", o_rdwr|    O_creat);        if (fd<0) {printf ("%d open error!\n", *ch);    return;    } for (i=0;i<32;i++) write (fd,pbuffer,1024*1024*8);//per 8M, total 256MB close (FD);    printf ("ssd%d test over!\n", *ch); return;} void testssd2 (int *ch)//Read Test {    int i=0;    int fd;         if (*ch==0)                fd = open ("/ssd1/ Test.dat ", o_rdwr| O_creat);    if (*ch==1)         fd = open ("/ssd2/test.dat", o_rdwr| O_creat);    if (*ch==2)         fd = open ("/ssd3/test.dat", o_rdwr| O_creat);    if (*ch==3)         fd = open ("/ssd4/test.dat", o_rdwr| O_creat);    if (*ch==4)         fd = open ("/ssd5/test.dat", o_rdwr| O_creat);    if (*ch==5)         fd = open ("/ssd6/test.dat", o_rdwr| O_creat);    if (*ch==6)         fd = open ("/ssd7/test.dat", o_rdwr| O_creat);    if (*ch==7)         fd = open ("/ssd8/test.dat", o_rdwr| O_creat);    if (fd<0)     {      &nbsP printf ("%d open error!\n", *ch);        return;   }     for (i=0;i<32;i++)         read (fd,pbuffer,1024*1024*8);     Close (FD);    printf ("ssd%d test over!\n", *ch);    return;}    int main () {printf ("This is the SSD speed Test begin!\n\n");      pthread_t _id[8];    int ret,i,ch[8];    struct Timeval start;        struct Timeval end;    float speed;    for (i=0;i<1024*1024*8;i++)//Initialize buffer pbuffer[i] = i&0xff; Gettimeofday (&start,null);//Start Timing------------for (i=0;i<8;i++) {Ch[i] = i;//start 8 threads Ret=pthread_      Create (_id+i,null, (void *) testssd1,ch+i);  if (ret!=0) {printf ("Create pthread error!\n");      return-1;  }} pthread_join (_id[0],null);      Wait for the respective to thread end Pthread_join (_id[1],null);      Pthread_join (_id[2],null);      Pthread_join (_id[3],null);      Pthread_join (_id[4],null);Pthread_join (_id[5],null);      Pthread_join (_id[6],null);      Pthread_join (_id[7],null); Gettimeofday (&end, NULL);//stop timing-------------speed = 1.0* (end.tv_sec-start.tv_sec) + (END.TV_USEC-START.TV_USEC) /1000000.0;//time printf ("SSD write speed:%6.5fmb/s (%6.5fsec) \ n", 256.0*8/speed,speed);           //Tempo printf ("This is SSD Speed Test over!\n\n"); return 0;}

Write Test Run Results:

#./test
# gcc Ssd_test.c-o test-lpthread
#./test
SSD Speed Test begin!

SSD4 Test over!
SSD0 Test over!
SSD6 Test over!
SSD1 Test over!
SSD5 Test over!
SSD7 Test over!
SSD2 Test over!
SSD3 Test over!
SSD Write speed:1563.73594mb/s (1.30968SEC)
SSD Speed Test over!

Read Test Run Results:

#./test

SSD Speed Test begin!

SSD1 Test over!
SSD7 Test over!
SSD3 Test over!
SSD2 Test over!
SSD4 Test over!
SSD5 Test over!
SSD6 Test over!
SSD0 Test over!
SSD Read speed:5915.16042mb/s (0.34623SEC)
SSD Speed Test over!

SSD Electronic disk speed detection under Linux