Re: [PATCH datacenter-manager 2/3] ui: d/rules: use thin instead of fat LTO

["Fabian Grünbichler" <f.gruenbichler@proxmox.com>]

On July 7, 2026 4:10 pm, Dominik Csapak wrote:
> 
> 
> On 7/7/26 4:05 PM, Fabian Grünbichler wrote:
>> On July 6, 2026 1:44 pm, Dominik Csapak wrote:
>>> fat LTO merges all LLVM modules into a single unit for optimizing.
>>> Changing this to thin LTO increases the uncompressed binary size by 1.59
>>> MiB (+11%) (compressed +192KiB/+4.6%) but save us ~160s (-40%) of (wall)
>>> build time during a 'make deb'.
>> 
>> but what are the effects on runtime performance? the same question also
>> applies to the next patch, a single codegen unit increases the amount of
>> optimizations the compiler can do..
> 
> 
> true, i didn't measure that. I'll see that i can come up with some
> sensible gui benchmark to measure this and I'll report back
> with the numbers..

and for completeness' sake - one way to solve this would be to split the
"release" build from a "fast" build (by putting one of them behind a
build profile). then the fast build could use thin LTO and multiple
codegen units, and the regular release build could still be optimized
for size and runtime speed (while taking longer to complete).

the "fast" build would then mainly be a final gate before submitting
patches, since most development will happen via trunk anyway..