Ok, this fix turned out to be easier once I tried things for myself: the prefix should be "quobyte:" (not "quobytefs:"). ==rob ________________________________________ From: Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] via discuss <[email protected]> Sent: Wednesday, June 11, 2025 10:25 To: [email protected] Cc: Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] Subject: Re: [mpich-discuss] [EXTERNAL] [BULK] How to make/run romio tests? An addendum, it's possible my "bugfix" as detailed in https: //github. com/pmodels/mpich/issues/7452 might not be enough. I have a code that uses `MPI_Info_set` to, well, set infos and I can't seem to affect the fs type. First I set:  ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd An addendum, it's possible my "bugfix" as detailed in https://urldefense.us/v3/__https://github.com/pmodels/mpich/issues/7452__;!!... <https://urldefense.us/v3/__https://github.com/pmodels/mpich/issues/7452__;!!G_uCfscf7eWS!aqjYcygbr3I8ZbKEHR9uOfQmiIa7WR2lVajdfRCYksA9leIz6X8t0pUZ9m8BzT8XyErKAf5BrG_M2fsmgucN-O7Wg10$> might not be enough. I have a code that uses `MPI_Info_set` to, well, set infos and I can't seem to affect the fs type. First I set: export ROMIO_PRINT_HINTS=1 and then in my code I added: call MPI_INFO_SET(info,"romio_filesystem_type","QUOBYTEFS:", status) but, well: key = romio_filesystem_type value = UFS: Generic ROMIO driver for all UNIX-like file systems I also tried it in lowercase as well. No joy. I've also tried: export ROMIO_FSTYPE_FORCE="QUOBYTEFS:" and: export ROMIO_FSTYPE_FORCE="quobytefs:" but in each case, it's still UFS. I do know my Infos are being seen by MPICH because if I toggled: call MPI_INFO_SET(info,"romio_cb_write","enable", status) from enable to disable, the ROMIO_PRINT_HINTS show the change. Matt [signature_3627681122]<https://urldefense.us/v3/__http://www.ssaihq.com/__;!!G_uCfscf7eWS!aqjYcygbr3I8ZbKEHR9uOfQmiIa7WR2lVajdfRCYksA9leIz6X8t0pUZ9m8BzT8XyErKAf5BrG_M2fsmgucNFDu3aGQ$> Matt Thompson Lead Scientific Software Engineer/Supervisor Global Modeling and Assimilation Office Science Systems and Applications, Inc. Code 610.1, 8800 Greenbelt Rd, Greenbelt, MD 20771 o: 301-614-6712 [email protected]<mailto:[email protected]> From: Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] via discuss <[email protected]> Date: Wednesday, June 11, 2025 at 9:37 AM To: [email protected] <[email protected]> Cc: Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] <[email protected]> Subject: [EXTERNAL] [BULK] [mpich-discuss] How to make/run romio tests? All, I'm trying to do some tests on a Quobyte system and we've seen confusing file write timings with Intel MPI and Open MPI. So, a bit of googling seeing if some MPI stack has a mention of Quobyte turns up: https: //www. quobyte. com/blog/quobyte-mpi-io-support-with-kernel-bypass-now-available/ ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd All, I'm trying to do some tests on a Quobyte system and we've seen confusing file write timings with Intel MPI and Open MPI. So, a bit of googling seeing if some MPI stack has a mention of Quobyte turns up: https://urldefense.us/v3/__https://www.quobyte.com/blog/quobyte-mpi-io-suppo... <https://urldefense.us/v3/__https://www.quobyte.com/blog/quobyte-mpi-io-support-with-kernel-bypass-now-available/__;!!G_uCfscf7eWS!foSdMay5QSiTxv1dePpWE5p5EOqkyr5hGLVXtgYBy6sY2_p9bErxn31S50_D4xpBCr1CIJCYqJV6YIlpDH99oVGEJLU$> and, yep, quobyte seems to be in MPICH! I grabbed MPICH 4.3.0 and built it (with one bug fix[1]) and well, it seems to run Hello World. So, following that Quobyte page, I get to Step 10 and tried the romio tests and...I am apparently dumb. I went to my build/src/mpi/romio/test directory and I see 'runtests' there, but:

./runtests make: *** No rule to make target 'default'. Stop.

I also tried with -fname and:

./runtests -fname=quobyte:test_mpi_file ./runtests: line 90: [quobyte:test_mpi_file: command not found make: *** No rule to make target 'default'. Stop.

./runtests -fname=quobyte:/home/mathomp4/MPI/src/mpich-4.3.0/build-ifort-2021.13/src/mpi/romio/test/test_mpi_file ./runtests: line 90: [quobyte:/home/mathomp4/MPI/src/mpich-4.3.0/build-ifort-2021.13/src/mpi/romio/test/test_mpi_file: No such file or directory make: *** No rule to make target 'default'. Stop.

Yeah. I'm stumped. I'm guessing I've missed some simple step along the way. NOTE: I have no idea even how to use romio really, but I was hoping the tests could, well, help me figure that out. Thanks for any help, Matt [1] See https://urldefense.us/v3/__https://github.com/pmodels/mpich/issues/7452__;!!... <https://urldefense.us/v3/__https://github.com/pmodels/mpich/issues/7452__;!!G_uCfscf7eWS!foSdMay5QSiTxv1dePpWE5p5EOqkyr5hGLVXtgYBy6sY2_p9bErxn31S50_D4xpBCr1CIJCYqJV6YIlpDH99XaSWwF0$> [signature_3314915376]<https://urldefense.us/v3/__http://www.ssaihq.com/__;!!G_uCfscf7eWS!foSdMay5QSiTxv1dePpWE5p5EOqkyr5hGLVXtgYBy6sY2_p9bErxn31S50_D4xpBCr1CIJCYqJV6YIlpDH99MYB1cYk$> Matt Thompson Lead Scientific Software Engineer/Supervisor Global Modeling and Assimilation Office Science Systems and Applications, Inc. Code 610.1, 8800 Greenbelt Rd, Greenbelt, MD 20771 o: 301-614-6712 [email protected]<mailto:[email protected]>