# Does the calculix solver have a limit on the number of nodes? **URL:** \ **Category:** General Questions\ **Created:** [July 18, 2022, 12:47pm UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301 "2022-07-18T12:47:27Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![xupeiwust](https://avatars.discourse-cdn.com/v4/letter/x/f0a364/32.png) [@xupeiwust](https://prepomax.discourse.group/u/xupeiwust)\ **Post date:** [July 18, 2022, 12:47pm UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/1 "2022-07-18T12:47:27Z")
Does the calculix solver have a limit on the number of nodes? The solver fails to solve when my model has more than 2 million nodes ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [July 18, 2022, 1:30pm UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/2 "2022-07-18T13:30:09Z")
It might be better to ask this question on the CalculiX forum but maybe this will help you: > **[DOFs limits or largest model ran?](https://calculix.discourse.group/t/dofs-limits-or-largest-model-ran/681)** > > Hello, dear CalculiX community! I’m working on a pretty big model of 12.2 million nodes (solid elements only) on a different solver, and I am wondering what is the largest size model some of you may have tried. This is just for reference only and... > **[Problem with Large Model Solution](https://calculix.discourse.group/t/problem-with-large-model-solution/748)** > > Dear Calculix users, I’m new user of Calculix software, and I have a problem with run large model (\> 1.5M nodes). I try to analysis this model, but when I run it the solution fail without defined which error occurring. However if I reduce model... ---
**Author:** ![xupeiwust](https://avatars.discourse-cdn.com/v4/letter/x/f0a364/32.png) [@xupeiwust](https://prepomax.discourse.group/u/xupeiwust)\ **Post date:** [July 19, 2022, 12:19pm UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/3 "2022-07-19T12:19:30Z")
thank you very much，I can’t seem to find a valid solution in it ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [July 19, 2022, 12:22pm UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/4 "2022-07-19T12:22:38Z")
Basically, it’s possible to solve large models in CalculiX since there are no hard limits. However, the choice of solver is important. Spooles and PaStiX may not handle very large numbers of DOFs but Pardiso can come to help in such cases. ---
**Author:** ![xupeiwust](https://avatars.discourse-cdn.com/v4/letter/x/f0a364/32.png) [@xupeiwust](https://prepomax.discourse.group/u/xupeiwust)\ **Post date:** [July 20, 2022, 11:49am UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/5 "2022-07-20T11:49:06Z")
Is the Pardiso solver only available on computers with intel cpu? ---
**Author:** ![xupeiwust](https://avatars.discourse-cdn.com/v4/letter/x/f0a364/32.png) [@xupeiwust](https://prepomax.discourse.group/u/xupeiwust)\ **Post date:** [July 20, 2022, 11:50am UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/6 "2022-07-20T11:50:08Z")
The memory used by the PaStiX solver is relatively large, and the solver that needs to be compiled with -i8 can solve large problems ---
**Author:** ![synt](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/synt/32/4658_2.png) [@synt](https://prepomax.discourse.group/u/synt)\ **Post date:** [July 20, 2022, 12:24pm UTC](https://prepomax.discourse.group/t/does-the-calculix-solver-have-a-limit-on-the-number-of-nodes/301/7 "2022-07-20T12:24:01Z")
> [@xupeiwust](#): > > Is the Pardiso solver only available on computers with intel cpu? _In older versions, setting the undocumented environment variable MKL\_DEBUG\_CPU\_TYPE=5 could be used to override the vendor string dependent codepath choice and activate supported instructions up to AVX2 on AMD processor based systems resulting in equal or even better performance when compared to Intel CPUs. Since at least Update 1 2020, the environment variable does not work anymore_ ([Wikipedia](https://en.wikipedia.org/wiki/Math_Kernel_Library)) for a user with non Intel processor, MKL version 2019 is the last resort.