Re: Performance issue of -var-list-children on structs with many members and remote targets

On 08/08/2014 03:25 PM, Raphael Zulliger wrote:
> Now my simple question: Couldn't GDB be tweaked to get the struct member 
> values by just one call (because members within a struct are guaranteed 
> to be consecutive, aren't they?):
> 
> 499,883 38-var-list-children var2.public
> 499,884 &"Sending packet: $m601050,24#??"
> 
> I guess this would dramatically increase overall performance.
> 
> I would really like to see such an improvement in GDB. Therefore, I'd be 
> very happy to hear your thoughts and suggestion. Thinks like: What 
> problems (e.g. border cases) could arise when implementing this? Where 
> to start in the GDB code for such a modification? Or do there exist any 
> GDB switches to improve performance on such operations? etc...

I have no idea how to merge multiple reads into one.

Cache is used in GDB to read code and stack from target, which
increases performance to some extent (See target_read_code and
target_read_stack).  However, cache is NOT used to read general data.
Probably, you can make general data reading use cache too.

-- 
Yao (齐尧)