Strings and memory use

[falkpl]

I am building a large string (1000-100M characters) of data which is done in a single vi and am running out of memory issues.  The problem I think is when I append small amounts of data to the large string I need 2* the amount of space of the concatinated string to do this.  is there a better way to do this? Pre allocate the required memory and insert characters?  Has anyone had similar issues?

Paul

[Norbert_B]

Paul,

maybe this will be interesting for you:




hope this helps,
Norbert

Message Edited by Norbert B on 09-24-2007 08:15 AM

[GerdW]

Hi Paul,

this is quite common in processing large data sets in LV.

You should always pre-allocate the array (a string is "just" a special U8-array) and use "replace array elements"-function. You can also detect buffer allocations using the "show buffer allocations" in the tools->advanced menu (LV7.1).

[falkpl]

Thanks I figured I would have to treat it as a U8 array and handle it myself.  Would be nice if strings also had a prebuilt set of functions which worked is U8 arrays.  I will do this and see if it fixes my problems.

paul