See message in mysqlslap.c, but basically

1) Parsing now works
2) Options are safer, aka it doesn't kill the machine and it cleans up after itself
3) Option of --only-print added so that you can see what it does.
4) Tiny cleanup of the auto generate sql. A lot more needs to be done with this, for it to be very valuable. I suspect it doesn't work all that well.
5) Delimeter is now a single character. No good escaping going on.
6) You can now change which schema it is runninng against.

Now I think I can go make use of it! 

Though I need to add support for a "only run this many inserts, divide by the number of clients connecting, to really test scaling"

client/client_priv.h

@@ -50,6 +50,8 @@ enum options_client
   OPT_NDBCLUSTER, OPT_NDB_CONNECTSTRING,
 #endif
   OPT_TRIGGERS,
+  OPT_MYSQL_ONLY_PRINT,
+  OPT_MYSQL_PRESERVE_SCHEMA_ENTER, OPT_MYSQL_PRESERVE_SCHEMA_EXIT,
   OPT_IGNORE_TABLE,OPT_INSERT_IGNORE,OPT_SHOW_WARNINGS,OPT_DROP_DATABASE,
   OPT_TZ_UTC, OPT_AUTO_CLOSE, OPT_CREATE_SLAP_SCHEMA,
   OPT_MYSQL_REPLACE_INTO, OPT_BASE64_OUTPUT, OPT_SERVER_ID

mysql-test/r/information_schema.result

@@ -725,7 +725,7 @@ CREATE TABLE t_crashme ( f1 BIGINT);
 CREATE VIEW a1 (t_CRASHME) AS SELECT f1 FROM t_crashme GROUP BY f1;
 CREATE VIEW a2 AS SELECT t_CRASHME FROM a1;
 count(*)
-103
+104
 drop view a2, a1;
 drop table t_crashme;
 select table_schema,table_name, column_name from
@@ -796,7 +796,7 @@ delete from mysql.db where user='mysqltest_4';
 flush privileges;
 SELECT table_schema, count(*) FROM information_schema.TABLES GROUP BY TABLE_SCHEMA;
 table_schema	count(*)
-information_schema	17
+information_schema	18
 mysql	18
 create table t1 (i int, j int);
 create trigger trg1 before insert on t1 for each row

mysql-test/t/mysqlslap.test

@@ -2,8 +2,12 @@
 --source include/not_embedded.inc
 --source include/not_windows.inc
 
---exec $MYSQL_SLAP --silent --drop-schema --concurrency=5 --concurrency-load=5 --iterations=20 --number-int-cols=2 --number-char-cols=3 --number-rows=12 --auto-generate-sql
+--exec $MYSQL_SLAP --silent --concurrency=5 --concurrency-load=5 --iterations=20 --number-int-cols=2 --number-char-cols=3 --number-rows=12 --auto-generate-sql
 
---exec $MYSQL_SLAP --silent --drop-schema --concurrency=5 --concurrency-load=5 --iterations=20 --number-rows=10 --query="select * from t1" --data="INSERT INTO t1 VALUES (1, 'This is a test')" --create="CREATE TABLE t1 (id int, name varchar(64))"
+--exec $MYSQL_SLAP --only-print --concurrency=5 --concurrency-load=5 --iterations=20 --number-rows=10 --query="select * from t1" --data="INSERT INTO t1 VALUES (1, 'This is a test')" --create="CREATE TABLE t1 (id int, name varchar(64))"
 
---exec $MYSQL_SLAP --silent --drop-schema --concurrency=5 --concurrency-load=5 --iterations=20 --delimiter=";" --number-rows=10 --query="select * from t1;select * from t2" --data="INSERT INTO t1 VALUES (1, 'This is a test'); insert into t2 values ('test', 'test2')" --create="CREATE TABLE t1 (id int, name varchar(64)); create table t2(foo1 varchar(32), foo2 varchar(32))"
+--exec $MYSQL_SLAP --silent --concurrency=5 --concurrency-load=5 --iterations=20 --number-rows=10 --query="select * from t1" --data="INSERT INTO t1 VALUES (1, 'This is a test')" --create="CREATE TABLE t1 (id int, name varchar(64))"
+
+--exec $MYSQL_SLAP --only-print --concurrency=5 --concurrency-load=5 --iterations=20 --delimiter=";" --number-rows=10 --query="select * from t1;select * from t2" --data="INSERT INTO t1 VALUES (1, 'This is a test'); insert into t2 values ('test', 'test2')" --create="CREATE TABLE t1 (id int, name varchar(64)); create table t2(foo1 varchar(32), foo2 varchar(32))"
+
+--exec $MYSQL_SLAP --silent --concurrency=5 --concurrency-load=5 --iterations=20 --delimiter=";" --number-rows=10 --query="select * from t1;select * from t2" --data="INSERT INTO t1 VALUES (1, 'This is a test'); insert into t2 values ('test', 'test2')" --create="CREATE TABLE t1 (id int, name varchar(64)); create table t2(foo1 varchar(32), foo2 varchar(32))"