dln/uuid_bench.md

## uuid_bench.md

      
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              uuid_bench.md
            
          
    TimeUUIDs in Python are slow. Clojure (Java) is fast.

Python

85 >>> def test():
    for _ in xrange(1000000):
        uuid.uuid1()
  ...: 

88 >>> %timeit test()                                                                                                                                      
1 loops, best of 3: 40.3 s per loop

=> 24 813 per second
See also:

uuid.uuid1() is too slow

Python (using python-libuuid extension)

3 >>> def test():
    for _ in xrange(1000000):
  ..:         libuuid.uuid1()
  ..:
4 >>> %timeit test()
1 loops, best of 3: 12.4 s per loop

=> 80 645 per second
5 >>> def test():
    for _ in xrange(1000000):
  ..:         libuuid.uuid1_bytes()
  ..:
6 >>> %timeit test()
1 loops, best of 3: 8.07 s per loop

=> 123 915 per second
See also:

python-libuuid @ github

Clojure / Java

user >>> (import [com.eaio.uuid])
nil

user >>> (time (dorun (repeatedly 1000000 #(com.eaio.uuid.UUID.))))
"Elapsed time: 561.999 msecs"
nil

=> 1 779 362 per second
user >>> (import [org.safehaus.uuid])
nil

user >>> (let [gen (org.safehaus.uuid.UUIDGenerator/getInstance)]
              (time (dorun (repeatedly 1000000 #(.generateTimeBasedUUID gen)))))
"Elapsed time: 641.732 msecs"

=> 1 558 283 per second
See also:

Johann Burkard's UUID
Java Uuid Generator (JUG)
Java UUID Generators Compared

C (libuuid)

$  cat << EOF | gcc -O2 -xc -luuid - && time ./a.out
> #include <uuid/uuid.h>
> 
> int main(int argc, char **argv)
> {
>   int i;
>   uuid_t uuid;
>   for (i=0; i<1000000; i++) {
>     uuid_generate_time(uuid);
>   }
> }
> EOF

real    0m7.093s
user    0m0.792s
sys     0m6.161s

=> 140 984 per second
This seems really slow. Anyone know why?
See also:

libuuid source
MySQL UUID() function, so fast it makes me nervous