Two programs to create and quickly query a read-only on disk hash table

src/apps/Makefile.am

@@ -1 +1 @@
-SUBDIRS = cht #cyrus
+SUBDIRS = cht readOnlyHash #cyrus

src/apps/readOnlyHash/Makefile.am

@@ -0,0 +1,3 @@
+LDADD=$(top_builddir)/src/lladd/liblladd.a $(top_builddir)/src/libdfa/librw.a
+bin_PROGRAMS=queryTable buildTable
+AM_CFLAGS=-g -Wall -pedantic -std=gnu99

src/apps/readOnlyHash/buildTable.c

@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <assert.h>
+#include <string.h>
+#include <lladd/transactional.h>
+#include <lladd/truncation.h>
+
+int main(int argc, char** argv) { 
+
+  Tinit();
+  char * key;
+  char * value;
+  
+  int ret;
+  int xid = Tbegin();
+
+  recordid hash = ThashCreate(xid, VARIABLE_LENGTH, VARIABLE_LENGTH);
+
+  //  printf("rid = %d, %d, %lld\n", hash.page, hash.slot, hash.size);
+  assert(hash.page == 1 && hash.slot == 0 && hash.size == 48);
+
+  struct timeval start;
+  struct timeval now;
+
+  gettimeofday(&start,0);
+
+  int count = 0;
+  while(EOF != (ret=scanf("%as\t%as\n", &key, &value))) {
+    if(!ret) { 
+      printf("Could not parse input!\n");
+      Tabort(xid);
+      Tdeinit();
+    }
+    //printf("->%s<-\t->%s<-\n", key, value);
+    ThashInsert(xid, hash, (byte*)key, strlen(key), (byte*)value, strlen(value));
+    errno = 0;
+    assert(errno == 0);
+    free(key);
+    free(value);
+    count ++;
+    
+    if(!(count % 10000)) { 
+      gettimeofday(&now,0);
+      double rate = ((double)count)/((double)(now.tv_sec-start.tv_sec));
+      printf("%d tuples inserted (%f per sec)\n", count, rate);
+    }
+
+  }
+  Tcommit(xid);
+  truncateNow();
+  Tdeinit();
+  return 0;
+}

src/apps/readOnlyHash/queryTable.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <assert.h>
+#include <string.h>
+#include <lladd/transactional.h>
+
+int main(int argc, char** argv) {
+  Tinit();
+
+  recordid hash = {1, 0, 48};
+  char * val;
+  if(-1 != ThashLookup(-1, hash, (byte*)argv[1], strlen(argv[1]), (byte**)&val)) { 
+    printf("%s\n", val);
+    free(val);
+  }
+  Tdeinit();
+  return 0;
+}