memory exhausted

My server configuration is:

CVS 1.12.13 on Solaris 11.

My client configuration is:

CVS 1.12.13 on Debian 4.0

I am trying to check out a project containing multiple binary files each less 
than 512 MB in size. The server reports the following error:

Nov 12 10:01:24 root cvs[879]: [ID 233912 daemon.emerg] error (1, 0) called recursively.  Original message was:
Nov 12 10:01:24 root cvs[879]: [ID 702911 daemon.emerg] cvs [checkout aborted]: memory exhausted
Nov 12 10:01:24 root cvs[879]: [ID 587406 daemon.emerg] error (1, 0) called recursively.  Second message was:
Nov 12 10:01:24 root cvs[879]: [ID 702911 daemon.emerg] cvs [checkout aborted]: memory exhausted
Nov 12 10:01:24 root cvs[879]: [ID 286756 daemon.emerg] Aborting.

The server reports sufficient physical memory available. Before:

Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     100193               391   10%
ZFS File Data               56597               221    5%
Anon                        42156               164    4%
Exec and libs               10991                42    1%
Page cache                   1053                 4    0%
Free (cachelist)             4824                18    0%
Free (freelist)            830328              3243   79%

Total                     1046142              4086
Physical                  1046141              4086

After:

Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     127140               496   12%
ZFS File Data              249138               973   24%
Anon                        41993               164    4%
Exec and libs               10799                42    1%
Page cache                   1053                 4    0%
Free (cachelist)           421502              1646   40%
Free (freelist)            194517               759   19%

Total                     1046142              4086
Physical                  1046141              4086

No per-process memory limits appear to be set. However, the cvs process is 
unable to memory-map the file:

mmap64(0x00000000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) = 0x08430000
mmap64(0x00000000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) = 0x08420000
mmap64(0x00000000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) Err#12 ENOMEM
mmap64(0x00000000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) Err#12 ENOMEM

Questions:

(0) Why is mmap64 failing in this case?
(1) Can the memory usage be limited?
(2) Can the number of files memory-mapped simultaneousely be limited?

Alex