cachelab started

cachelab/cbsl/examples/simple_usage.c

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+/*
+ * Copyright 2019 Yuta Hirokawa (University of Tsukuba, Japan)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <cbsl.h>
+
+#define ARRAY_SIZE(X)        (sizeof((X))/sizeof(*(X)))
+#define CBSL_ERROR_CHECK(X)  {if ((X) == cbsl_error) { fprintf(stderr, "error: %s\n", (#X)); }}
+
+int    a[1024]; /* 4 KiB */
+double b[1024]; /* 8 KiB */
+
+extern void save(void);
+extern void load(void);
+extern void rand_int(int, int*);
+extern void rand_double(int, double*);
+
+char cname[128];
+
+int main(int argc, char** argv) {
+  srand((unsigned int)(time(NULL)));
+
+  sprintf(cname, "checkpoint.zst");
+
+  if (strcmp(argv[1],"-c") == 0)
+  {
+    rand_int(ARRAY_SIZE(a), a);
+    rand_double(ARRAY_SIZE(b), b);
+    save();
+  }
+  else if (strcmp(argv[1],"-r") == 0)
+  {
+    load();
+  }
+  else
+  {
+    return 1;
+  }
+
+  return 0;
+}
+
+void save(void) {
+  cbsl_ctx* ctx = cbsl_open(cbsl_store_mode, "./checkpoint.data");
+
+  if (ctx == NULL) {
+    fprintf(stderr, "error: cbsl_open save\n");
+    exit(1);
+  }
+
+  CBSL_ERROR_CHECK(cbsl_write(ctx, a, sizeof(a)));
+  CBSL_ERROR_CHECK(cbsl_write(ctx, b, sizeof(b)));
+  CBSL_ERROR_CHECK(cbsl_close(ctx));
+
+  printf("before compressed a[%d] = %d\n", 124, a[124]);
+  printf("before compressed b[%d] = %e\n", 514, b[514]);
+}
+
+void load(void) {
+  cbsl_ctx* ctx = cbsl_open(cbsl_load_mode, "./checkpoint.data");
+
+  if (ctx == NULL) {
+    fprintf(stderr, "error: cbsl_open load\n");
+    exit(1);
+  }
+
+  CBSL_ERROR_CHECK(cbsl_read(ctx, a, sizeof(a)));
+  CBSL_ERROR_CHECK(cbsl_read(ctx, b, sizeof(b)));
+  CBSL_ERROR_CHECK(cbsl_close(ctx));
+
+  printf("decompressed a[%d] = %d\n", 124, a[124]);
+  printf("decompressed b[%d] = %e\n", 514, b[514]);
+}
+
+
+void rand_int(int n, int *v) {
+  for(int i = 0; i < n; ++i)
+    v[i] = rand();
+}
+
+void rand_double(int n, double *v) {
+  for(int i = 0; i < n; ++i)
+    v[i] = 1.0 / (double)(rand());
+}