Walter Bright Wrote:

> 
> http://www.digitalmars.com/d/1.0/changelog.html http://ftp.digitalmars.com/dmd.1.038.zip
> 
> 
> 
> http://www.digitalmars.com/d/2.0/changelog.html http://ftp.digitalmars.com/dmd.2.022.zip

What's changed in the compiler to increase compile times so dramatically with this build? It's about a five-fold increase. My code uses some templates, but not what you'd call excessively, and there are no cyclic imports.

On Fri, 19 Dec 2008 14:51:11 +0300, John C <johnch_atms@hotmail.com> wrote:

> Walter Bright Wrote:
>
>>
>> http://www.digitalmars.com/d/1.0/changelog.html
>> http://ftp.digitalmars.com/dmd.1.038.zip
>>
>>
>>
>> http://www.digitalmars.com/d/2.0/changelog.html
>> http://ftp.digitalmars.com/dmd.2.022.zip
>
> What's changed in the compiler to increase compile times so dramatically with this build? It's about a five-fold increase. My code uses some templates, but not what you'd call excessively, and there are no cyclic imports.

Pure and nothrow semantics checks, perhaps (even if you don't use them)?

On Fri, Dec 19, 2008 at 9:12 PM, Denis Koroskin <2korden@gmail.com> wrote:
> On Fri, 19 Dec 2008 14:51:11 +0300, John C <johnch_atms@hotmail.com> wrote:
>
>> Walter Bright Wrote:
>>
>>>
>>> http://www.digitalmars.com/d/1.0/changelog.html http://ftp.digitalmars.com/dmd.1.038.zip
>>>
>>>
>>>
>>> http://www.digitalmars.com/d/2.0/changelog.html http://ftp.digitalmars.com/dmd.2.022.zip
>>
>> What's changed in the compiler to increase compile times so dramatically with this build? It's about a five-fold increase. My code uses some templates, but not what you'd call excessively, and there are no cyclic imports.
>
> Pure and nothrow semantics checks, perhaps (even if you don't use them)?

D1 is slower too, so that doesn't explain it.

Going from what's in the changelog, I've got my suspicions it's the
fix for this one that's responsible:
http://d.puremagic.com/issues/show_bug.cgi?id=2500
Total guess though.

--bb

Bill Baxter wrote:
> On Fri, Dec 19, 2008 at 9:12 PM, Denis Koroskin <2korden@gmail.com> wrote:
>> On Fri, 19 Dec 2008 14:51:11 +0300, John C <johnch_atms@hotmail.com> wrote:
>>> What's changed in the compiler to increase compile times so dramatically
>>> with this build? It's about a five-fold increase. My code uses some
>>> templates, but not what you'd call excessively, and there are no cyclic
>>> imports.
>> Pure and nothrow semantics checks, perhaps (even if you don't use them)?
> 
> D1 is slower too, so that doesn't explain it.
> 
> Going from what's in the changelog, I've got my suspicions it's the
> fix for this one that's responsible:
> http://d.puremagic.com/issues/show_bug.cgi?id=2500
> Total guess though.

That is the cyclic import problem. Can you check again to see if you have cyclic imports?

Reply to Walter,


> That is the cyclic import problem. Can you check again to see if you
> have cyclic imports?
> 

could you add a flag to DMD that will give a waning on cyclical imports?

On Fri, Dec 19, 2008 at 8:51 PM, John C <johnch_atms@hotmail.com> wrote:
> Walter Bright Wrote:
>
>>
>> http://www.digitalmars.com/d/1.0/changelog.html http://ftp.digitalmars.com/dmd.1.038.zip
>>
>>
>>
>> http://www.digitalmars.com/d/2.0/changelog.html http://ftp.digitalmars.com/dmd.2.022.zip
>
> What's changed in the compiler to increase compile times so dramatically with this build? It's about a five-fold increase. My code uses some templates, but not what you'd call excessively, and there are no cyclic imports.

John, is your code small enough that you could extract a reasonable
test case to give to Walter?
My code involves maybe a hundred files, and does perhaps use templates
"excessively". :-)

--bb

--bb

BCS wrote:
>> That is the cyclic import problem. Can you check again to see if you
>> have cyclic imports?
>>
> 
> could you add a flag to DMD that will give a waning on cyclical imports?

I could, but in the meantime I want to find the source of the slowdown.

Bill Baxter wrote:
> My code involves maybe a hundred files, and does perhaps use templates
> "excessively". :-)

Excess isn't the problem, I want to see if import cycles is.

Also, try putting them all (most) on the same command line, and see if the speed improves.

On Sat, Dec 20, 2008 at 10:41 AM, Walter Bright <newshound1@digitalmars.com> wrote:
> Bill Baxter wrote:
>>
>> My code involves maybe a hundred files, and does perhaps use templates "excessively". :-)
>
> Excess isn't the problem, I want to see if import cycles is.
>
> Also, try putting them all (most) on the same command line, and see if the
> speed improves.
>

I'm pretty sure they are all on the same command line now for me, because I use DSSS with oneatatime turned off.  I think in that case DSSS generates a single command like to compile everything.

--bb

On Sat, Dec 20, 2008 at 10:39 AM, Walter Bright <newshound1@digitalmars.com> wrote:
> BCS wrote:
>>>
>>> That is the cyclic import problem. Can you check again to see if you have cyclic imports?
>>>
>>
>> could you add a flag to DMD that will give a waning on cyclical imports?
>
> I could, but in the meantime I want to find the source of the slowdown.

Without such a warning it's a bit difficult to track down if there are
cyclic imports or not.  At least in my code.
I was hoping John C's example is maybe of  a little more manageable size.

--bb