Segfault on creating a Ctx about tiledb-py HOT 6 CLOSED

Hi @nvictus, this looks to be an internal TileDB bug from the last version. We are working on getting ready for the next release (1.3.0) next week and I think this should be addressed.

I'll leave this issue open until I can reproduce / confirm.

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@manolinux I think your issue is different than the one above. The illegal instruction issue hints that the conda toolchain compiled with SSE or AVX vector instructions that your platform does not support.

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Hi, with the following configuration, it still happens:
conda list | grep tile
tiledb 1.4.1 h36a7fd7_0 conda-forge
tiledb-py 0.3.0 py36h3e44d54_0 conda-forge

python
Python 3.6.6 | packaged by conda-forge | (default, Oct 12 2018, 14:08:43)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-15)] on linux
Type "help", "copyright", "credits" or "license" for more information.

import tiledb
ctx=tiledb.Ctx()
Illegal instruction (core dumped)

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@manolinux I think your issue is different than the one above. The illegal instruction issue hints that the conda toolchain compiled with SSE or AVX vector instructions that your platform does not support.

Thanks a lot for your quick answer. Yes, you're right. It seems my old Celeron Dual Core does not accept AVX instructions. As a workaround, just to get used to how works Tiledb API, I've made it work using Intel Software Development emulator: https://software.intel.com/en-us/articles/intel-software-development-emulator/

[manolinux@madoff sde-intel]$ ./sde64 -- python
Python 3.6.6 | packaged by conda-forge | (default, Oct 12 2018, 14:08:43)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-15)] on linux
Type "help", "copyright", "credits" or "license" for more information.

import tiledb
ctx = tiledb.Ctx()
print (ctx)
<tiledb.libtiledb.Ctx object at 0x7fd3288c6d38>

And got rid of "Illegal Instruction" at the cost of worsening performance ... until I gather money for a new computer ;)

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I think this issue raises an important issue though, which is the conda packages should target some default arch. I think assuming sse support is a good baseline arch to compile to, almost all modern x86_64 bit computers should have support for that. We should not distribute binaries that have AVX instructions. I've added an issue on the the tiledb conda feedstock to enforce this.

@manolinux a better workaround would be to install tiledb from source, or if you are using TileDB-Python, pip-install tiledb. That will build the TileDB binary and Python extension from source automatically.

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@nvictus I just double-checked that the issue you reported is fixed.

@manolinux we've fixed the latest binaries on conda to follow the conda architecture defaults (-march=core2 -mtune=haswell -mssse3). Hopefully this resolves the problem.

Closing for now, if there is still an issue please let us know.

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