Memory used by an object

[GaryD]

Is there a way in VW to determine how much memory is being used by a particular object?

I realise that this may be someting of a "what if" type of question.
I ask because I would like to get an idea of how much data I can load into an image safely from a database.

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vw7.7 nc
Windows XP Home SP3

[charles]

this is really more of an issue of creating a custom memory policy to handle bulk loads gracefully. There is mechanism for counting i.e. based on how many instvars an object has  plus taking into account the object header and or course its a recursive process to understand the total weight of a particular object but I forget how things are weighted i.e. the byte count. Check out the advanced profilers parcel  there are some stats regarding memory consumption associated to a particular measured process. In a 64 bit vm the answer should be essentially any entire db could be cached in a VW image in a 32 bit vm the answer is quite a lot . In my shop we do "database caching".

hth,

[GaryD]

That helps, thanks, I'll look into it.
The database I had in mind was relatively small, only around 15,000 discreet data items.

Gary

[charles]

We load a lot more than that and basically do not even use a custom memory policy i.e. don't create our own subclass but rather just push the memory parameters up.

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