Activity
From 18 Mar 2024 to 16 Apr 2024
16 Apr 2024
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22:46 Slug #1394: Oddly slow GBasis computation (slow final cleanup)
- This might be another example where "final clean up" is not instant:...
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- I have just removed @long long@ from @MachineInt@ (and had to change one call in @BigIntOps.C@)
There are actually *... -
- Indices into matrices (and other indexable objects, _e.g._ @ModuleElem@?) must be non-negative.
As already noted ind...
15 Apr 2024
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- I think we are close to a decision: not to use @(unsigned) long long@ except perhaps internally.
I don't regard it a... -
- Winfried Bruns sent the following response by email:...
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- My current thoughts are that we should avoid using LL/ULL in any (normal) user interfaces, but we may use them intern...
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- Anna thinks she has found the cause. She'll do some more tests to confirm; then we hope to fix it.
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- *Anna* plans to investigate today
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- I am quite tempted just to try changing the automatic conversion, but this should probably also be done with some oth...
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- I think we need a new central issue regard possible redesign of @MachineInt@
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- I wonder if this change should be reconsidered in light of the discussion in #1804?
14 Apr 2024
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20:44 Design #1804: Use long long (at least sometimes)?
- To be honest, I would also rather keep support for 32-bit platforms instead of using e.g., ...
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- The more I think about making a "typedef", the less I am convinced. For convenience I shall suppose it is called *@C...
13 Apr 2024
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- > Personally I was hoping to drop support for 32-bit platforms, but long on MinGW is only 32-bits.
Actually, MinGW... -
- Nico sent the following comment by email:...
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- Here is a list of CPP symbols beginning with *@COCOA_@*
* @COCOA_ULONG2LONG@
* @COCOA_ULONGLONG2LONGLONG@
* @COCOA...
10 Apr 2024
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11:47 Support #1814: Ensure tests do not need too much RAM
- Ulrich von der Ohe wrote:
> @test-RadicalMembership1.C@ did not change from 0.99824 to 0.99850. Do you think the 20-...
09 Apr 2024
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23:31 Support #1814: Ensure tests do not need too much RAM
- John Abbott wrote:
> * there was a bug in @IsInRadical@ which meant that it always returned @true@ IIRC
@test-Rad... -
- I'm not sure if I am recalling correctly the time-line...
* there was a bug in @IsInRadical@ which meant that it alw... -
- John Abbott wrote:
> I'm not surprised by the change in resources needed for @test-RadicalMembership1.C@ since the t... -
- I am a bit concerned that *@long long@* may incur unnecessary overhead on some platforms.
We could also have a CoC... -
- John Abbott wrote:
> Did we use a workaround?
The workaround introduced in #1662#note-4 is indeed in effect in ne...
08 Apr 2024
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- My idea did not produce much gain (neither regarding time nor memory requirement).
There's a loop somewhere which is... -
- It is not clear to me why @test-SparsePolyRing1-b.C@ should have become slower by a factor of 2.
I'm not surprised b... -
- I realize that this issue was intended to be about something else. Feel free to move my posts as you see fit -- sorry...
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- ...
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- ...
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- I have advanced this issue to *resolved* since it seems to be OK now -- thanks Nico for the clarification!
Anna is a... -
- I am using txt2tags 3.9 and it works fine on my end as well. This issue was only related to txt2tags 2.7-dev (commits...
07 Apr 2024
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- The tests @test-RadicalMembership1@ and @test-SparsePolyRing2@ are the only ones where memory usage considerably wors...
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- Strictly this is not CoCoALib but CoCoA-5.
I ran the CoCoA-5 tests with about 0.5GiB memory: there was 1 failure, na... -
- Assuming that @ulimit -v@ does what I think/hope it does, I confirm that the only test to fail with a limit of @25000...
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- On my linux box the command *@ulimit -v 1048576@* will limit memory use to 1GiB (which seems a reasonable limit to me...
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- Ulrich also reported that *@test-SparsePolyRing2@* now needs about 3GiB of RAM at some point. That is rather a lot!
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- I think the slow down may be due to a change in code in radical (of ideals)" I believe we now speculatively try to co...
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- Ulrich reports by email that the test *@test-SparsePolyRing2@* has become significantly slower; also perhaps @test-Sp...
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- *AnnA* can you check whether this issue can now be closed?
Ulrich reports that 0.99850 is OK with txt2tags-2.6; I s...
06 Apr 2024
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- The files released as 0.99850 work for me with txt2tags 2.6 (the latest stable 2.x version) as well as with txt2tags ...
31 Mar 2024
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- Just a small question to throw in the room: Might it be worth considering to migrate to ...
29 Mar 2024
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- There is no dependency on configuration/version in doc/Makefile for index...html.
(on the other hand the pdf manual ... -
- set to 100% (after being closed)
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*done* Redmine Roadmap: close or postpone issue
*done* Redmine Release issues: check percentages, check timi...
28 Mar 2024
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- I think Nico said it is OK now. Closing!
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- Also the interpreter has CPP symbols without the CoCoA prefix. Is that right?
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- Some files have include guards without the @CoCoA_@ prefix...
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- Release issues:
https://cocoa.dima.unige.it/redmine/projects/cocoalib/issues?query_id=49
Here is a list of the ma... -
- Everything related to making a CoCoALib release:
Redmine Roadmap: close or postpone issue
Redmine Release... -
- Updated documentation submodule.txt (need proper example ex-syz.C)
Updated CoCoA-5 test test-syz, cvs-ed and include... -
- restored "final decisions" in description removed by mistake.
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- added documentation for CoCoA-5
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- Dealing with syzygies is non-trivial, expecially with shifts.
There is a dedicated function NewFreeModuleForSyz whic... -
- This issue originates #78 (for CoCoA-5).
However, elimination orderings are widely used in CoCoALib (not just for el... -
- New syntax @NewPolyRingElim(....)@ would be handy, and also easily transferred to CoCoA-5.
Design its interface (eg:...
27 Mar 2024
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- Still to do: documentations showing how to deal with 0 entries, in CoCoALib and in CoCoA5
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- Anna Maria Bigatti wrote:
> Should we make @SyzOfGens@ obsolescent? does it do anything more than calling @syz(gens... -
- I moved this issue from CoCoA-5 to CoCoALib
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26 Mar 2024
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- Michele Toriell is asking for this. There was C++ from when i was in Passau: dig it out, and blow the dust off.
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- Good idea to make comprehensive tests.... perhaps not easy.
Why "feedback" and 10% complete?
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- This issue is old.
I'm making a test file test-sys.cocoa5.
I'll update and write there what we have working for hom... -
- I think this has been agreed upon a long time ago, as explained in #582-3.
Moreover the recent addition of the conte... -
- In the general picture of improving the error codes, I suggest a trivial (though extensive) change.
Look at these na... -
- Added also to NewFreeModuleForSyz.
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- Anna Maria Bigatti wrote:
> This is my suggestion: implement a new function @syz0@ which allows 0s in the input (giv...
25 Mar 2024
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- Personally I was hoping to drop support for 32-bit platforms, but @long@ on MinGW is only 32-bits. Does MinGW offer ...
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- Winfried Bruns suggested in issue #1661 to consider using *@long long@* wherever we want more than 32-bits.
Investig... -
- This might be a separate issue: should there also be a similar function which "prepares" the generators for computin...
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- Sum is clever -- if HasGBasis(I) and is ideal(1).
Do the same for product and for other similar operations.... -
- First steps:
* remove 0 generators
* if any generator is 1 (or invertible) then the ideal is 1
* for integer ideal... -
- Generalize the ideas of issue #1647 to other types of ideal (and modules?)
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- Moving note-33 (product) to another issue, because not related to generators.
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- Sum is clever -- if HasGBasis(I) and is ideal(1)
Do it also for product.... -
- The function for CoCoA-5 is VersionInfo() defined in BuiltingFunctions.C
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- We need to consider the behaviour both in CoCoALib and in CoCoA-5.
Anna suggests that it is more helpful to mainta... -
- Three things:
* why do some preprocessor flags have prefix *@COCOA_@* while others have *@CoCoA_@* ?
* for whom are... -
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- Anna Maria Bigatti wrote:
> Add the value of this flag to "VersionInfo()" in CoCoA-5 (work for me)
and in BuildI... -
- Add the value of this flag to "VersionInfo()" in CoCoA-5 (work for me)
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- I believe I have made all necessary changes. So closing -- it works fine for us...
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- to be improved (see Nicolas Jagersma code using GPoly)
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- We have long tried to avoid unsigned values because they can cause inconvenient, silent, automatic conversions.
But ... -
- Currently there is an "implicit" conversion from @SmallPrime@ to @signed long@.
Should the conversion instead be to ... -
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- Anna Maria Bigatti wrote:
> I suggest having all headers in SparsePolyOps-RingElem.H (well indicated) and the "vecto... -
- After trying to rearrange the header files I found this problem.
There are functions on vectors of RingElem need hea... -
- After closing I realized that the "coefficients" functions were missing and that the .H files were not aligned.
Stil... -
- Anna Maria Bigatti wrote:
> Add syz and syz0 (allowing 0s) for vector of RingElem
*syz* should stay in @submodule...
24 Mar 2024
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- Apart from being untidy (& possibly embarassing) the old code does sometimes cost time if we have to maintain it.
Wh... -
- The sources contain some quite old code which is likely no longer used.
We should identify the code and consider rem...
22 Mar 2024
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- A macro like ...
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- I have been working through Nico's changes. Still undecided about several of them :-/
The 32-bit vs 64-bit problems... -
- The problem with ...
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- Is any of this still relevant?
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- Probably the functions ElimMat-like are good enough for this.
At least we should write some explicit example here (f... -
- There are two improvements we can still make:
# tell myFinalizeGBasis interreduce only the polynomials with the want... -
- Now it takes 165s (I don't know how long it was before)
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- Anna Maria Bigatti wrote:
> Apart from the improvements we can do for @elim@ (and are about to do ;-)
I wonder if... -
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- John Abbott wrote:
> Anna points out that the actual cost is the normal form reduction inside the *@isin@* operator.... -
- Anna points out that the actual cost is the normal form reduction inside the *@isin@* operator. The computation of t...
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- Current timings after the LT checking in the final cleaning (just marginally better than before, but most of the time...
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- I changed the verbosity to 130 (to see what goes on in the -Final clean up)
Now it is faster because the polynomials... -
- Improved (see #777-12).
Still, could be more clever when computing elimination and some reductions are completely us... -
- Remember to add tests to test-GB.cocoa5
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- Good thing I wrote #1212-19! My first implementation was wrong (embarrassing).
Now all implemented and I added a Co... -
- I prefer to go through similar situations before changing the current names.
Make a list.
Postponing.
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- Different situations to consider (from #1619-8)
* monomial
* homog
* principal
* univariate
* general
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- Add syz and syz0 (allowing 0s) for vector of RingElem
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- The test in note-3 would be faster if called in the minimal sub-polyring.
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- From #1641-11
It seems it's the "high number of variables" problem, and syz itself is quite fast: this examples take... -
- Investigate whether it is a good idea to adapt certain operations to compute in a sub polyring (without unnecessary i...
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- I though we had a class for incremental gaussian reduction. That should be useful in this case!
We can also make ... -
- The old CoCoA-5 radical code is currently still available as function @radical_COCOALANGUAGE@ in the radical.cpkg5 pa...
21 Mar 2024
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- My previous comment just above is correct, but we can sometimes do better.
I think we need to consider just the "low... -
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- I'm too lazy to track down all the functions which ought to be tested, and then to write the corresponding tests.
So... -
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- I have added some new tests to @test-SparsePolyRing1.C@.
I conform that Anna's example from comment 11 does seems to... -
- The problem for multivariate syz with many indets (from note-8 on) seems to be considered in #1057 and #1068, so I wo...
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- It seems it's the "high number of variables" problem, and syz itself is quite fast: this examples takes ~4s on my com...
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- Ah yes, I do have debugging on.
Do you get a measurable time difference if the ring contains just 3 indets or if it ... -
- John Abbott wrote:
> The new code seems to work now, and is faster if the polys are recognized as univariate.
>
>... -
- I also added the factorization in the case of a monomial (similar test as in #967-5, now in test0saturate.cocoa5).
... -
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- John Abbott wrote:
> The problem was that in @BuiltInFunctions-CoCoALib.C@ there was a call to @I->mySaturate(J)@ in... -
- added CoCoA-5 test-saturate.cocoa5
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- John Abbott wrote:
> Maybe different types:
> * monomial
> * principal
> * univariate
> * general
also homog
20 Mar 2024
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- The new code seems to work now, and is faster if the polys are recognized as univariate.
What I do not understand ... -
- This is all done (I believe) for ideals in SparsePolyRing.
Do it also for ideals in other rings (should we have anot... -
- Added documentation for CoCoALib/5.
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- I liked this too much and I did it.
Called in some lib/5 tests, called by GradingMat.
Easy enough. should not need...
19 Mar 2024
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- Made some progress. This is more tedious than I thought... the doc for CoCoALib could be better... (and the design t...
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- The problem code is in @SparsePolyOps-RingElem.C@ around line 718 (search for @SyzOfGens@ or maybe just @syz@).
I...
18 Mar 2024
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- *Hi Jerry James*
Could I send you a TGZ of the latest sources, so that you can try compiling, and see whether there ... -
- *@sat@* is perhaps too short, and may be ambiguous with the *@SAT@* (satisfiability) family of functions.
I'm undeci... -
- [Conversation with Robbiano]
XXXX-ation gives a commutative feeling, XXXX-ate gives and action (non-commutative) fee... -
- Also *@IntersectionList@*
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- In CoCoA-4 we had intersection and saturation. Now we have a mixture...
Singular and Macaulay use *@intersect@* a... -
- Perhaps *@ERR::NYI@* ?
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- For the time being: should we give error? (as if non-homogeneous?)
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- If the grading is positive and over ZZ^1 then we use the following general cut-off so that we do not need to scan the...
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- This was mostly done anyway. I changed some things in the involutive code (without really understanding it).
I ha... -
- John will investigate this, and hopefully close it.
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- In principle we could make 2 such functions: one faster, and one more thorough.
But is it worth it? KISS?
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- In #1645#note-28 there is a list of easy checks one might want to do on a given set of polynomial generators.
See al... -
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- List in #1647-9
Anna Maria Bigatti wrote:
> Add a function @CleanupGens@ making some more easy checks?
Moved i... -
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- I activated a test (slightly simplified test7 in test-GOperation1.C).
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- See #1326#note-10 for discussion about elim(I,X) vs elim(X,I).
Apart from this, we should only add some tests in CoC... -
- We have noticed that sometimes (with SetVerbosityLevel(100)) the time spent in "Final clean up" is quite long.
The c... -
- The SparsePolyOps files are quite focused on a specific topic.
Doc would be easier to maintain if kepts separately.
... -
- See #1783-2 : one doc file for each topic/file
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- Maybe different types:
* monomial
* principal
* univariate
* general
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