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Wouldn’t it be even smaller to do this
message Packet {
repeated uint32 pids = 1 [packed=true];
repeated string execnames = 2;
}
working under the assumption that the two repeated fields will be the
same length? You will burn two bytes of overhead for the tag and length
for the pids field, plus two bytes of overhead per process for the
execnames field, for a total of 2N+2. This is less than the 5N for
option 1 or 3×15 + 5×(N-15) for option 2, for most values of N.
Chris
since then you would
On Mon, 5 Aug 2013 10:32:03 -0700 (PDT)
George Wong <[email protected]> wrote:
> Hello,
>
> I was wondering which of the following ways to define a .proto would
> be faster / more space efficient -- or if there'd be no difference at
> all...
>
> Option 1:
> message Packet {
>
> ...
> repeated Process process = 6;
> ...
> message Process {
> optional uint32 pid = 1;
> ...
> optional string execname = 14;
> }
> }
>
> or Option 2:
> message Packet {
>
> ...
> optional uint32 pid1 = 6;
> ...
> optional string execname1 = 20;
> optional uint32 pid2 = 21;
> ...
> optional string execname2 = 35;
> }
>
>
> I'm essentially wondering what effect "loop unwinding" has in a
> protobuf (and yes, I know how many of the Process protos I have).
> Because the ID is used, I'm wondering if the extra byte (when you go
> from 15 to 255) is that much of an issue. Also I'm not sure how
> actually reading into the "repeated" works, so I'm wondering about
> speed (in creation/setting/encoding/decoding/reading).
>
>
> Thanks!
>
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