Re: [lisp-snmp] Memory usage of ASN.1 library

[Chun T. (binghe) <bin...@gm...>]

Hi, John

First, I should say sorry for my delay on the work of "runtime MIB  
loading". I've been hired as a commercial Lisp programmer since one  
month ago, and I don't have much time working on cl-net-snmp these  
days. I hope I can have some time to finish it in next month. However,  
you (and MSI) are still my big "client" :)

I understand heavily calls to OID-NUMBER-LIST will cause consing too  
much.

For optimize, I want to add two more slots in class OBJECT-ID: VALUES  
(to hold the cache of "oid number list" and "oid length"). This is  
reasonable because a OBJECT-ID instance won't change their "oid number  
list" once created, so calculate it just once will work.

Actual test shows that, by using this cache, repeated calls to OID- 
NUMBER-LIST on the "same" oid instance won't cons any more after the  
first call:

ASN.1 14 > (time (oid-number-list (oid "system")))
Timing the evaluation of (OID-NUMBER-LIST (OID "system"))

User time    =        0.000
System time  =        0.000
Elapsed time =        0.000
Allocation   = 900 bytes
0 Page faults
(1 3 6 1 2 1 1)

ASN.1 15 > (time (oid-number-list (oid "system")))
Timing the evaluation of (OID-NUMBER-LIST (OID "system"))

User time    =        0.000
System time  =        0.000
Elapsed time =        0.000
Allocation   = 24 bytes
0 Page faults
(1 3 6 1 2 1 1)

Please test the new ASN.1 patch (4-16.lisp) in attach, it's a loadable  
patch: you could load it (remember compile it first) into your running  
lisp image even AFTER all OID instances in your application are  
created, and you'll get the faster version of OID-NUMBER-LIST then.

I hope that helps.

Regards,

Chun Tian (binghe)