# cublasSasum fails if result is on device

**URL:** https://forums.developer.nvidia.com/t/cublassasum-fails-if-result-is-on-device/139805
**Category:** GPU-Accelerated Libraries
**Created:** [July 1, 2020, 12:52am UTC](https://forums.developer.nvidia.com/t/cublassasum-fails-if-result-is-on-device/139805 "2020-07-01T00:52:17Z")
**Posts on this page:** 1
**Showing post:** 2

<div class="post-metadata">

### Author: ![mfatica](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@mfatica](https://forums.developer.nvidia.com/u/mfatica)
#### Post date: [July 1, 2020, 1:56am UTC](https://forums.developer.nvidia.com/t/cublassasum-fails-if-result-is-on-device/139805/2 "2020-07-01T01:56:19Z")

</div>

You need to set the pointer mode to device before the second call to cublasSasum:

cublasSetPointerMode(cublas\_handle, CUBLAS\_POINTER\_MODE\_DEVICE);

res=10.000000  
d\_res=10.000000

---

_[View the full topic](https://forums.developer.nvidia.com/t/cublassasum-fails-if-result-is-on-device/139805)._