go - runtime.duffcopy is called a lot -


when profiling app, , run top, see 

showing top 10 nodes out of 31 (cum >= 0.12s)       flat  flat%   sum%        cum   cum%     13.93s 63.00% 63.00%     13.93s 63.00%  runtime.duffcopy

i struggling know when , why called , if there can improve this? need see function these calls made or there general rule-of-thumb should think about?

i have read named return values can improve this, quite big function testing lot of conditions (returning true or false), don't know if idea implement that.

thanks

think solved it. had @ assembly output , saw had 

for _, v := range c.items

an item relatively big object, replaced above loop with

for index := 0; index < len(c.items); index++

and used direct access of objects c.items[index]. top shows:

350ms  4.85% 60.47%      350ms  4.85%  runtime.duffcopy

the overall execution time cut 12s 4s. quite nice :)


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