enforce a minimum chunk size

src/config.c

@@ -138,7 +138,6 @@ CONF_Add(const char *lval, const char *rval)
 
     confUnsigned("max.reclen", max_reclen);
     confUnsigned("maxkeylen", maxkeylen);
-    confUnsigned("chunk.size", chunk_size);
     confUnsigned("qlen.goal", qlen_goal);
     confUnsigned("nworkers", nworkers);
     confUnsigned("restarts", restarts);
@@ -150,6 +149,17 @@ CONF_Add(const char *lval, const char *rval)
     confNonNegativeDouble("idle.pause", idle_pause);
     confNonNegativeDouble("tx.timeout", tx_timeout);
 
+    if (strcmp(lval, "chunk.size") == 0) {
+        unsigned int i;
+        int err = conf_getUnsignedInt(rval, &i);
+        if (err != 0)
+            return err;
+        if (i < MIN_CHUNK_SIZE)
+            return EINVAL;
+        config.chunk_size = i;
+        return(0);
+    }
+
     if (strcmp(lval, "max.records") == 0) {
         unsigned int i;
         int err = conf_getUnsignedInt(rval, &i);

src/test/regress.sh

@@ -29,7 +29,7 @@ rm -f $LOG $MSG
 # "Not running as root" filtered so that the test is independent of
 # the user running it
 CKSUM=$( grep -v 'Worker 1' $LOG |  sed -e 's/\(initializing\) \(.*\)/\1/' | sed -e 's/\(Running as\) \([a-zA-Z0-9]*\)$/\1/' | grep -v 'Not running as root' | cksum)
-if [ "$CKSUM" != '625760318 214345' ]; then
+if [ "$CKSUM" != '3927549947 214347' ]; then
     echo "ERROR: Regression test incorrect reader log cksum: $CKSUM"
     exit 1
 fi

src/trackrdrd.h

@@ -222,7 +222,8 @@ struct config {
     unsigned	restart_pause;
     unsigned	thread_restarts;
     unsigned	chunk_size;
-#define DEF_CHUNK_SIZE 64
+#define DEF_CHUNK_SIZE 256
+#define MIN_CHUNK_SIZE 64
 
     unsigned	tx_limit;
 } config;