User contributions for Honfi001

6 August 2026

• 14:5514:55, 6 August 2026 diff hist +206 OpenMPI No edit summary current Tag: Visual edit
• 14:4814:48, 6 August 2026 diff hist +15 Software No edit summary current Tag: Visual edit
• 14:4614:46, 6 August 2026 diff hist +212 OpenMPI Add recommended environment section Tag: Visual edit

5 August 2026

• 14:4614:46, 5 August 2026 diff hist −571 IntelMPI No edit summary current Tag: Visual edit
• 14:4014:40, 5 August 2026 diff hist +12,754 N IntelMPI Created page with "'''Intel MPI''' is the other MPI implementation available on Anunna, alongside OpenMPI. It arrives as part of the Intel toolchain, together with the Intel compilers and the Intel Math Kernel Library (MKL). Everything general about MPI — that it runs one program as many cooperating processes, that it has to be built into the program, and when it is the right tool at all — is covered on Multi-Process Workflows. This page is the Intel-sp..."
• 14:0714:07, 5 August 2026 diff hist +14 Software No edit summary Tag: Visual edit
• 14:0414:04, 5 August 2026 diff hist −1,039 OpenMPI Trimming Tag: Visual edit
• 13:5513:55, 5 August 2026 diff hist −1,715 OpenMPI Trimming Tag: Visual edit
• 13:4313:43, 5 August 2026 diff hist +17,111 N OpenMPI Created page with "'''OpenMPI''' is the MPI library Anunna is built around. MPI — the Message Passing Interface — is how a single program runs as many cooperating processes at once, each with its own private memory, passing messages between themselves as the calculation proceeds. It is what lets one job use more than one node. This page is the practical side: which OpenMPI modules exist here, how to launch a job on one node and across several, and how to choose the network transport,..."
• 11:3611:36, 5 August 2026 diff hist +3 m Software No edit summary Tag: Visual edit
• 09:5509:55, 5 August 2026 diff hist +19 m Workflows No edit summary current Tag: Visual edit
• 09:5409:54, 5 August 2026 diff hist +11,748 N Workflows/Multi-Process Created page with "Multi-threaded work gave one process many arms, and then ran into a wall: threads share memory, and shared memory stops at the edge of the machine. This page is how a single calculation gets past that wall — not by growing one process, but by running '''many separate processes''', each with its own private memory, that send messages to each other as the calculation proceeds. The standard way to do that is '''MPI''', the Message Passing Inte..." current
• 09:2909:29, 5 August 2026 diff hist +36 m Workflows No edit summary Tag: Visual edit
• 08:0208:02, 5 August 2026 diff hist −30 Workflows/Multi-threaded Fix links current Tag: Visual edit
• 07:5907:59, 5 August 2026 diff hist −20 Workflows/Embarassinly-Parallel Embarassinly Parallel current Tag: Visual edit
• 07:3907:39, 5 August 2026 diff hist −3,683 Workflows/Embarassinly-Parallel No edit summary
• 07:3107:31, 5 August 2026 diff hist +15,432 N Workflows/Embarassinly-Parallel Created page with "This tutorial is a gentle, hands-on introduction to '''parallel computing on Anunna'''. Instead of a heavy scientific code, it uses one friendly problem — estimating the number π by throwing random darts — and runs the ''same'' calculation across every kind of parallelism the cluster offers: a single core, many threads, many processes, multiple nodes, and a GPU. Because the problem stays the same, you can see exactly what each step up the ladder buys you. You do no..."

28 July 2026

• 19:1819:18, 28 July 2026 diff hist +58 Workflows No edit summary Tag: Visual edit
• 19:1519:15, 28 July 2026 diff hist +7,857 N Workflows/Multi-threaded Created page with "Serial ran one program on one core. This page takes that same job and lets the program spread its work across '''many''' cores on the '''same''' machine — still one process, but now with several ''threads'' inside it, all sharing the same memory. It is the gentlest real step up the ladder, because for most tools someone else already did the hard part: the program already knows how to use extra cores. Your job is only to give it some, and..."
• 19:1519:15, 28 July 2026 diff hist −9 Workflows →Parallel Workflows Tag: Visual edit

27 July 2026

• 10:3610:36, 27 July 2026 diff hist 0 m Workflows/Serial Honfi001 moved page Workflows/Serial-Workflows to Workflows/Serial without leaving a redirect current
• 10:3510:35, 27 July 2026 diff hist +5,636 N Workflows/Serial Created page with "Every other page in this section describes a way of splitting work across many cores. This one describes ''not'' doing that — one program, running on a single core, from start to finish. It is the baseline, and, to be honest up front, it is not a parallel workflow at all. It earns a page anyway, for two reasons. Most software you did not ''specifically'' choose for its parallelism runs this way, so this is where many jobs on Anunna may actually belong. And every othe..."

23 July 2026

• 15:4015:40, 23 July 2026 diff hist −1 m Workflows/Parallel-Computing →Why not just ask for a thousand cores current Tag: Visual edit
• 15:2615:26, 23 July 2026 diff hist +47 Workflows/Parallel-Computing →Why not just ask for a thousand cores: Add link to wikipedia article on Amdahl's law Tag: Visual edit
• 15:2315:23, 23 July 2026 diff hist +33 Workflows →Parallel Workflows Tag: Visual edit
• 15:2215:22, 23 July 2026 diff hist 0 m Workflows/Parallel-Computing Honfi001 moved page Workflows/Paralle-Computing to Workflows/Parallel-Computing without leaving a redirect
• 15:2015:20, 23 July 2026 diff hist +5 Workflows/Parallel-Computing →Why not just ask for a thousand cores Tag: Visual edit
• 15:1915:19, 23 July 2026 diff hist +4 Workflows/Parallel-Computing No edit summary Tag: Visual edit
• 15:1815:18, 23 July 2026 diff hist +7,647 N Workflows/Parallel-Computing Created page with "Your analysis runs. It just runs for too long, or it no longer fits on one machine. '''Parallel computing''' is the answer to both, and this page is the map: what it actually means on Anunna, and which of the six workflow types below is yours. Each section is a short paragraph and a link. Read them, recognise your own problem in one of them, and follow it. If you would rather learn by doing, the π estimation tutorial walks the sa..."
• 15:0715:07, 23 July 2026 diff hist +494 Network & Security No edit summary current Tag: Visual edit
• 12:2512:25, 23 July 2026 diff hist −22 Workflows No edit summary Tag: Visual edit
• 11:5511:55, 23 July 2026 diff hist +17 Workflows No edit summary Tag: Visual edit
• 11:5211:52, 23 July 2026 diff hist +163 Workflows No edit summary Tag: Visual edit

22 July 2026

• 18:5518:55, 22 July 2026 diff hist +12 Workflow Engines (Snakemake, Nextflow) →Pitfalls current Tag: Visual edit
• 18:5418:54, 22 July 2026 diff hist +3 Workflow Engines (Snakemake, Nextflow) No edit summary Tag: Visual edit: Switched
• 18:5318:53, 22 July 2026 diff hist +346 Workflow Engines (Snakemake, Nextflow) →Set up Tag: Visual edit
• 16:4616:46, 22 July 2026 diff hist −271 Workflow Engines (Snakemake, Nextflow) add snakemake module load info. Tag: Visual edit
• 16:0916:09, 22 July 2026 diff hist +4,090 Workflow Engines (Snakemake, Nextflow) →Nextflow Tag: Visual edit: Switched

21 July 2026

• 14:1514:15, 21 July 2026 diff hist −6 Workflows Replace performance optimizations with Parallel Workflows Tag: Visual edit
• 12:1012:10, 21 July 2026 diff hist +138 m Batch Jobs →Loading modules current Tag: Visual edit
• 11:5611:56, 21 July 2026 diff hist +11 m Batch Jobs →Comment / project accounting Tag: Visual edit
• 11:3411:34, 21 July 2026 diff hist −17 Performance Optimization/Multiple nodes (MPI) →Running an MPI program current Tag: Visual edit
• 07:4007:40, 21 July 2026 diff hist −1 m Compute Hardware Overview No edit summary current Tag: Visual edit

20 July 2026

• 13:2313:23, 20 July 2026 diff hist +2,498 Compute Hardware Overview No edit summary Tag: Visual edit

24 June 2026

• 09:1509:15, 24 June 2026 diff hist +124 N File:Pi-tutorial-speedup-vs-cores.png Speedup against the serial baseline. The dashed line is perfect (linear) speedup; real runs sit just below it. current
• 09:1409:14, 24 June 2026 diff hist +128 N File:Pi-tutorial-walltime-vs-cores.png Wall time falls as cores are added. Note both axes are logarithmic; a straight line here means near-ideal scaling. current
• 09:0109:01, 24 June 2026 diff hist +40 Tutorials →Parallelism current Tag: Visual edit
• 08:5908:59, 24 June 2026 diff hist +118 N File:Pi-tutorial-best-per-approach.png Plot of comparing the performance of different parallelization strategies for the MonteCarlo Pi Tutorial current
• 08:4008:40, 24 June 2026 diff hist +15,432 N Tutorials/Parallelism-Estimating-Pi Created page with "This tutorial is a gentle, hands-on introduction to '''parallel computing on Anunna'''. Instead of a heavy scientific code, it uses one friendly problem — estimating the number π by throwing random darts — and runs the ''same'' calculation across every kind of parallelism the cluster offers: a single core, many threads, many processes, multiple nodes, and a GPU. Because the problem stays the same, you can see exactly what each step up the ladder buys you. You do no..." current
• 08:3808:38, 24 June 2026 diff hist +36 Tutorials No edit summary Tag: Visual edit