resource: fallback to sysconf when failed to detect memory size from hwloc for branch-2025.1 #8
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…hwloc On Fedora 41 AMI on some aarch64 instance such as m7gd.16xlarge, Seastar program such as Scylla fails to startup with following error message: ``` $ /opt/scylladb/bin/scylla --log-to-stdout 1 WARNING: debug mode. Not for benchmarking or production hwloc/linux: failed to find sysfs cpu topology directory, aborting linux discovery. scylla: seastar/src/core/resource.cc:683: resources seastar::resource::allocate(configuration &): Assertion `!remain' failed. ``` It seems like hwloc is failed to initialize because of /sys/devices/system/cpu/cpu0/topology/ not available on the instance. I debugged src/core/resource.cc to find out why assert occured, and found that alloc_from_node() is failing because node->total_memory is 0. It is likely because of failure of hwloc initialize described above. I also found that calculate_memory() going wrong since machine->total_memory is also 0. To avoid the error on such environment, we need to fixup memory size on both machine->total_memory and node->total_memory. We can use sysconf(_SC_PAGESIZE) * sysconf(_SC_PHYS_PAGES) for this, just like we do on non-hwloc version of allocate(). Fixes scylladb/scylladb#22382 Related scylladb/scylla-pkg#4797 (cherry picked from commit b0a9f89)
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Submodule update queued for 2025.1. |
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This is backported version of scylladb/seastar#2624
On Fedora 41 AMI on some aarch64 instance such as m7gd.16xlarge, Seastar program such as Scylla fails to startup with following error message:
It seems like hwloc is failed to initialize because of /sys/devices/system/cpu/cpu0/topology/ not available on the instance.
I debugged src/core/resource.cc to find out why assert occured, and found that alloc_from_node() is failing because node->total_memory is 0. It is likely because of failure of hwloc initialize described above.
I also found that calculate_memory() going wrong since machine->total_memory is also 0.
To avoid the error on such environment, we need to fixup memory size on both machine->total_memory and node->total_memory. We can use sysconf(_SC_PAGESIZE) * sysconf(_SC_PHYS_PAGES) for this, just like we do on non-hwloc version of allocate().
Fixes scylladb/scylladb#22382
Related scylladb/scylla-pkg#4797
(cherry picked from commit b0a9f89)