Varnish memory usage

[Michael Lenaghan]

What a way to start! Obviously, I accidentally hit "send." Let's try
this again...

I'm running Varnish 2.1 on Ubuntu 10.04. We ran a test to purposely
fill Varnish's cache. We've defined that cache as "malloc,1G". After
running our test, "top" shows:

1486m VIRT memory
1.3g RES memory
81m SHR memory

Either I've mis-configured something or mis-understood something.
Either way, help is appreciated.

In case it's of use the output of varnishstat follows.

0+05:22:49                                               domU-12-31-38-00-9D-27
Hitrate ratio:       10      100     1000
Hitrate avg:     0.0381   0.0813   0.0705

        3889         0.00         0.20 Client connections accepted
      227735         0.99        11.76 Client requests received
       10916         0.00         0.56 Cache hits
      215592         0.00        11.13 Cache misses
      211160         0.00        10.90 Backend conn. success
          12         0.00         0.00 Backend conn. failures
        5646         0.99         0.29 Backend conn. reuses
      211144         0.00        10.90 Backend conn. was closed
      216791         0.99        11.19 Backend conn. recycles
        4575         0.99         0.24 Fetch with Length
      212231         0.00        10.96 Fetch chunked
          31          .            .   N struct sess_mem
           2          .            .   N struct sess
      205011          .            .   N struct object
      205014          .            .   N struct objectcore
      205014          .            .   N struct objecthead
           1          .            .   N struct vbe_conn
         500          .            .   N worker threads
         500         0.00         0.03 N worker threads created
     1259710         0.00        65.04 N worker threads limited
           2          .            .   N backends
       10569          .            .   N expired objects
        4425          .            .   N LRU moved objects
      216589         0.99        11.18 Objects sent with write
        3889         0.00         0.20 Total Sessions
      227735         0.99        11.76 Total Requests
        1226         0.99         0.06 Total pass
      216806         0.99        11.19 Total fetch
    97606086       221.79      5039.29 Total header bytes
   833650072         2.97     43040.43 Total body bytes
          13         0.00         0.00 Session Closed
      231611         0.99        11.96 Session herd
    21199614        59.41      1094.51 SHM records
      697327         2.97        36.00 SHM writes
          38         0.00         0.00 SHM MTX contention
           8         0.00         0.00 SHM cycles through buffer
      432162         0.99        22.31 SMA allocator requests
      410022          .            .   SMA outstanding allocations
   966403669          .            .   SMA outstanding bytes
 27988956353          .            .   SMA bytes allocated
 27022552684          .            .   SMA bytes free
          13         0.00         0.00 SMS allocator requests
        3670          .            .   SMS bytes allocated
        3670          .            .   SMS bytes freed
      216806         0.99        11.19 Backend requests made
           1         0.00         0.00 N vcl total
           1         0.00         0.00 N vcl available
           1          .            .   N total active purges
           1         0.00         0.00 N new purges added
       19369         1.98         1.00 Client uptime