redis vs couch vs fs

DB:
Generating cache data...
Total Keys: 10000
Smallest Key Data: 1
Largest Key Data: 1024
Average Key Data: 513.3336
Total Key Data: 5133336
Total Tags: 2000
Least Tags/key: 0
Most Tags/key: 15
Average Tags/key: 7.3806
Total Tags/key: 73806
Generating operations...
Completed generation of test data for test 'default'.
Run your test like so:

Redis test:

Cache Backend: Cm_Cache_Backend_Redis
Loading default test data...
Loaded 10000 cache records in 11.85 seconds (11.6811 seconds cache time). Data size is 4989.1K
Benchmarking 4 concurrent clients, each with 50000 operations...
4 concurrent clients completed in 24 seconds

         |   reads|  writes|  cleans
------------------------------------
Client  0| 2209.75|  342.47|  441.86
Client  3| 2206.01|  331.48|  450.88
Client  2| 2195.37|  338.60|  451.96
Client  1| 2192.30|  319.76|  455.99
------------------------------------
ops/sec  | 8803.43| 1332.31| 1800.69

Couch test: 


Cache Backend: couchbase (Varien_Cache_Backend_Couchbase)
Loading default test data...
Loaded 10000 cache records in 46.82 seconds (46.6483 seconds cache time). Data size is 5013.0K
Benchmarking 4 concurrent clients, each with 50000 operations...
4 concurrent clients completed in 26 seconds

         |   reads|  writes|  cleans
------------------------------------
Client  1| 2430.62|  115.38|   21.17
Client  2| 2430.37|  111.69|   24.06
Client  3| 2411.11|  150.59|   18.15
Client  0| 2431.28|  118.56|   14.33
------------------------------------
ops/sec  | 9703.38|  496.22|   77.71


Filesystem cache test
Cache Backend:  (Zend_Cache_Backend_File)
Loading default test data...
Loaded 10000 cache records in 3.54 seconds (3.3660 seconds cache time). Data size is 4992.9K
Benchmarking 4 concurrent clients, each with 50000 operations...
4 concurrent clients completed in 44 seconds

         |   reads|  writes|  cleans
------------------------------------
Client  3| 8196.75| 2328.99|    1.25
Client  1| 8732.93| 2281.13|    1.36
Client  0| 8710.90| 2357.89|    1.39
Client  2| 8967.24| 2236.69|    1.40
------------------------------------
ops/sec  |34607.82| 9204.70|    5.40