lock = dsg.getLock() ;
int id = gen.incrementAndGet() ;
for ( int i = 0 ; i < repeats ; i++ )
{
try {
lock.enterCriticalSection(Lock.WRITE) ;
log.debug("writer start "+id+"/"+i) ;
int x1 = count("SELECT * { ?s ?p ?o }", dsg) ;
int z = change(dsg, id, i) ;
pause(maxpause) ;