From 3808f903625f42f58aa95e43e3caca3efaa4d118 Mon Sep 17 00:00:00 2001
From: Sanjit Bhat <sanjit.bhat@gmail.com>
Date: Mon, 30 Oct 2023 14:39:28 -0500
Subject: lock: release lab
---
user/bcachetest.c | 189 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 189 insertions(+)
create mode 100644 user/bcachetest.c
(limited to 'user/bcachetest.c')
diff --git a/user/bcachetest.c b/user/bcachetest.c
new file mode 100644
index 0000000..5dc46ef
--- /dev/null
+++ b/user/bcachetest.c
@@ -0,0 +1,189 @@
+#include "kernel/fcntl.h"
+#include "kernel/param.h"
+#include "kernel/types.h"
+#include "kernel/stat.h"
+#include "kernel/riscv.h"
+#include "kernel/fs.h"
+#include "user/user.h"
+
+void test0();
+void test1();
+
+#define SZ 4096
+char buf[SZ];
+
+int
+main(int argc, char *argv[])
+{
+ test0();
+ test1();
+ exit(0);
+}
+
+void
+createfile(char *file, int nblock)
+{
+ int fd;
+ char buf[BSIZE];
+ int i;
+
+ fd = open(file, O_CREATE | O_RDWR);
+ if(fd < 0){
+ printf("createfile %s failed\n", file);
+ exit(-1);
+ }
+ for(i = 0; i < nblock; i++) {
+ if(write(fd, buf, sizeof(buf)) != sizeof(buf)) {
+ printf("write %s failed\n", file);
+ exit(-1);
+ }
+ }
+ close(fd);
+}
+
+void
+readfile(char *file, int nbytes, int inc)
+{
+ char buf[BSIZE];
+ int fd;
+ int i;
+
+ if(inc > BSIZE) {
+ printf("readfile: inc too large\n");
+ exit(-1);
+ }
+ if ((fd = open(file, O_RDONLY)) < 0) {
+ printf("readfile open %s failed\n", file);
+ exit(-1);
+ }
+ for (i = 0; i < nbytes; i += inc) {
+ if(read(fd, buf, inc) != inc) {
+ printf("read %s failed for block %d (%d)\n", file, i, nbytes);
+ exit(-1);
+ }
+ }
+ close(fd);
+}
+
+int ntas(int print)
+{
+ int n;
+ char *c;
+
+ if (statistics(buf, SZ) <= 0) {
+ fprintf(2, "ntas: no stats\n");
+ }
+ c = strchr(buf, '=');
+ n = atoi(c+2);
+ if(print)
+ printf("%s", buf);
+ return n;
+}
+
+// Test reading small files concurrently
+void
+test0()
+{
+ char file[2];
+ char dir[2];
+ enum { N = 10, NCHILD = 3 };
+ int m, n;
+
+ dir[0] = '0';
+ dir[1] = '\0';
+ file[0] = 'F';
+ file[1] = '\0';
+
+ printf("start test0\n");
+ for(int i = 0; i < NCHILD; i++){
+ dir[0] = '0' + i;
+ mkdir(dir);
+ if (chdir(dir) < 0) {
+ printf("chdir failed\n");
+ exit(1);
+ }
+ unlink(file);
+ createfile(file, N);
+ if (chdir("..") < 0) {
+ printf("chdir failed\n");
+ exit(1);
+ }
+ }
+ m = ntas(0);
+ for(int i = 0; i < NCHILD; i++){
+ dir[0] = '0' + i;
+ int pid = fork();
+ if(pid < 0){
+ printf("fork failed");
+ exit(-1);
+ }
+ if(pid == 0){
+ if (chdir(dir) < 0) {
+ printf("chdir failed\n");
+ exit(1);
+ }
+
+ readfile(file, N*BSIZE, 1);
+
+ exit(0);
+ }
+ }
+
+ for(int i = 0; i < NCHILD; i++){
+ wait(0);
+ }
+ printf("test0 results:\n");
+ n = ntas(1);
+ if (n-m < 500)
+ printf("test0: OK\n");
+ else
+ printf("test0: FAIL\n");
+}
+
+// Test bcache evictions by reading a large file concurrently
+void test1()
+{
+ char file[3];
+ enum { N = 200, BIG=100, NCHILD=2 };
+
+ printf("start test1\n");
+ file[0] = 'B';
+ file[2] = '\0';
+ for(int i = 0; i < NCHILD; i++){
+ file[1] = '0' + i;
+ unlink(file);
+ if (i == 0) {
+ createfile(file, BIG);
+ } else {
+ createfile(file, 1);
+ }
+ }
+ for(int i = 0; i < NCHILD; i++){
+ file[1] = '0' + i;
+ int pid = fork();
+ if(pid < 0){
+ printf("fork failed");
+ exit(-1);
+ }
+ if(pid == 0){
+ if (i==0) {
+ for (i = 0; i < N; i++) {
+ readfile(file, BIG*BSIZE, BSIZE);
+ }
+ unlink(file);
+ exit(0);
+ } else {
+ for (i = 0; i < N*20; i++) {
+ readfile(file, 1, BSIZE);
+ }
+ unlink(file);
+ }
+ exit(0);
+ }
+ }
+
+ for(int i = 0; i < NCHILD; i++){
+ wait(0);
+ }
+ printf("test1 OK\n");
+}
--
cgit v1.2.3
From 3c0a25fc4383140b3f8bf83f5eef4cbb14062e94 Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Tue, 2 Jan 2024 10:04:23 -0500
Subject: x
---
user/bcachetest.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 129 insertions(+)
(limited to 'user/bcachetest.c')
diff --git a/user/bcachetest.c b/user/bcachetest.c
index 5dc46ef..ccf7516 100644
--- a/user/bcachetest.c
+++ b/user/bcachetest.c
@@ -8,6 +8,7 @@
void test0();
void test1();
+void test2();
#define SZ 4096
char buf[SZ];
@@ -17,6 +18,7 @@ main(int argc, char *argv[])
{
test0();
test1();
+ test2();
exit(0);
}
@@ -187,3 +189,130 @@ void test1()
}
printf("test1 OK\n");
}
+
+//
+// test concurrent creates.
+//
+void
+test2()
+{
+ int nc = 4;
+ char file[16];
+
+ printf("start test2\n");
+
+ mkdir("d2");
+
+ file[0] = 'd';
+ file[1] = '2';
+ file[2] = '/';
+
+ // remove any stale existing files.
+ for(int i = 0; i < 50; i++){
+ for(int ci = 0; ci < nc; ci++){
+ file[3] = 'a' + ci;
+ file[4] = '0' + i;
+ file[5] = '\0';
+ unlink(file);
+ }
+ }
+
+ int pids[nc];
+ for(int ci = 0; ci < nc; ci++){
+ pids[ci] = fork();
+ if(pids[ci] < 0){
+ printf("test2: fork failed\n");
+ exit(1);
+ }
+ if(pids[ci] == 0){
+ char me = "abcdefghijklmnop"[ci];
+ int pid = getpid();
+ int nf = (ci == 0 ? 10 : 15);
+
+ // create nf files.
+ for(int i = 0; i < nf; i++){
+ file[3] = me;
+ file[4] = '0' + i;
+ file[5] = '\0';
+ // printf("w %s\n", file);
+ int fd = open(file, O_CREATE | O_RDWR);
+ if(fd < 0){
+ printf("test2: create %s failed\n", file);
+ exit(1);
+ }
+ int xx = (pid << 16) | i;
+ for(int nw = 0; nw < 2; nw++){
+ // the sleep() increases the chance of simultaneous
+ // calls to bget().
+ sleep(1);
+ if(write(fd, &xx, sizeof(xx)) <= 0){
+ printf("test2: write %s failed\n", file);
+ exit(1);
+ }
+ }
+ close(fd);
+ }
+
+ // read back the nf files.
+ for(int i = 0; i < nf; i++){
+ file[3] = me;
+ file[4] = '0' + i;
+ file[5] = '\0';
+ // printf("r %s\n", file);
+ int fd = open(file, O_RDWR);
+ if(fd < 0){
+ printf("test2: open %s failed\n", file);
+ exit(1);
+ }
+ int xx = (pid << 16) | i;
+ for(int nr = 0; nr < 2; nr++){
+ int z = 0;
+ sleep(1);
+ int n = read(fd, &z, sizeof(z));
+ if(n != sizeof(z)){
+ printf("test2: read %s returned %d, expected %d\n", file, n, sizeof(z));
+ exit(1);
+ }
+ if(z != xx){
+ printf("test2: file %s contained %d, not %d\n", file, z, xx);
+ exit(1);
+ }
+ }
+ close(fd);
+ }
+
+ // delete the nf files.
+ for(int i = 0; i < nf; i++){
+ file[3] = me;
+ file[4] = '0' + i;
+ file[5] = '\0';
+ //printf("u %s\n", file);
+ if(unlink(file) != 0){
+ printf("test2: unlink %s failed\n", file);
+ exit(1);
+ }
+ }
+
+ exit(0);
+ }
+ }
+
+ int ok = 1;
+
+ for(int ci = 0; ci < nc; ci++){
+ int st = 0;
+ int ret = wait(&st);
+ if(ret <= 0){
+ printf("test2: wait() failed\n");
+ ok = 0;
+ }
+ if(st != 0)
+ ok = 0;
+ }
+
+ if(ok){
+ printf("test2 OK\n");
+ } else {
+ printf("test2 failed\n");
+ }
+}
--
cgit v1.2.3