# Rpc error when running autotune tutorial

**URL:** <https://discuss.tvm.apache.org/t/rpc-error-when-running-autotune-tutorial/6725>\
**Category:** Troubleshooting\
**Created:** [May 19, 2020, 10:00am UTC](https://discuss.tvm.apache.org/t/rpc-error-when-running-autotune-tutorial/6725 "2020-05-19T10:00:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![qiang](https://discuss.tvm.apache.org/letter_avatar_proxy/v4/letter/q/c68b51/32.png) [@qiang](https://discuss.tvm.apache.org/u/qiang)\
**Post date:** [May 19, 2020, 10:00am UTC](https://discuss.tvm.apache.org/t/rpc-error-when-running-autotune-tutorial/6725/1 "2020-05-19T10:00:50Z")

</div>

Hi, I tested a local autotune with nvidia K80. first, the error messages are like:

```auto
GFLOPS: 0.00/0.00	
result: MeasureResult(costs=(RuntimeError('Traceback (most recent call last):\n [bt] (5)
libtvm.so(TVMSynchronize+0x4a) [0x7fb40b8a12ea]\n [bt] (4) 
libtvm.so(tvm::runtime::RPCDeviceAPI::StreamSync(DLContext, void*)+0x3bb) [0x7fb40b91fe1b]\n [bt] (3) 
libtvm.so(tvm::runtime::RPCClientSession::StreamSync(DLContext, void*)+0x9e) [0x7fb40b8fb7ce]\n [bt] (2) 
libtvm.so(+0x1569da4) [0x7fb40b8f9da4]\n [bt] (1) 
libtvm.so(+0x1569cee) [0x7fb40b8f9cee]\n [bt] (0) 
libtvm.so(dmlc::LogMessageFatal::~LogMessageFatal()+0x',),), error_no=4, all_cost=1.2601652145385742, timestamp=1589867856.6892421)	
[('tile_f', [-1, 2, 16, 4]), ('tile_y', [-1, 1, 1, 7]), ('tile_x', [-1, 1, 7, 1]), ('tile_rc', [-1, 1, 8]), ('tile_ry', [-1, 3, 1]), ('tile_rx', [-1, 1, 3]), ('auto_unroll_max_step', 0), ('unroll_explicit', 1)],None,6679987

```

when i try to trace the “DLContext” above, I found ctx.device\_type==130, i dont understand that code.

And one thing, my gpu machine is network limited, with max 10 free port to use. I’d modified rpc port config in python related things.

ah… help please!

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<div class="post-metadata">

**Author:** ![qiang](https://discuss.tvm.apache.org/letter_avatar_proxy/v4/letter/q/c68b51/32.png) [@qiang](https://discuss.tvm.apache.org/u/qiang)\
**Post date:** [May 21, 2020, 5:00am UTC](https://discuss.tvm.apache.org/t/rpc-error-when-running-autotune-tutorial/6725/2 "2020-05-21T05:00:33Z")

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solved! just with git src update.