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pyvisa / pyvisa-py

A pure python PyVISA backend

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[COM] Performance issue - slow transfer - USB

0xDEADBEEF-ASAP opened this issue · comments

commented

Hi! SDS1202XE , USB, pyvisa, pyvisa-py, pyusb, arch Linux (os not virtualized).

750.1 KiB / 1 min transfer rate.

Can it be improved? What can I change or check to make it faster?

Tried different chunk size, timeouts, baudrates, with and without python venv, with and without '@py'.

IMG_221

IMG_20

IMG_20240328_132032

commented

Can you post the output of ptvisa-info and try to downgrade to 0.7.1 ?

0.7.2 introduce a fix that may be responsible for the slow transfer you observe.

commented

I will downgrade to 0.7.1 tomorrow, and post a feedback.

For now pyvisa-info:

Machine Details:
Platform ID: Linux-6.8.2-arch2-1-x86_64-with-glibc2.39
Processor:

Python:
Implementation: CPython
Executable: /home/arch/usbtmc/.venv/bin/python
Version: 3.11.8
Compiler: GCC 13.2.1 20230801
Architecture: ('x86', 64)
Build: Feb 12 2024 14:50:05 (#main)
Unicode: UCS4

PyVISA Version: 1.14.1

Backends:
ivi:
Version: 1.14.1 (bundled with PyVISA)
Binary library: Not found
py:
Version: 0.7.2
USB INSTR: Available via PyUSB (1.2.1). Backend: libusb1
USB RAW: Available via PyUSB (1.2.1). Backend: libusb1
TCPIP INSTR: Available
Resource discovery:

  • VXI-11: partial (psutil not installed)
  • hislip: disabled (zeroconf not installed)
    TCPIP SOCKET: Available
    ASRL INSTR:
    Please install PySerial (>=3.0) to use this resource type.
    No module named 'serial'
    VICP INSTR:
    Please install PyVICP to use this resource type.
    GPIB INSTR:
    Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities.
    No module named 'gpib'
    GPIB INTFC:
    Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities.
    No module named 'gpib'
commented

Hi! pyvisa-py 0.7.1 it download screenshot super fast but first screenshot is incomplete 200kb , next screenshots are 60kb - full screenshot should be ~750kb). Oscilloscopeis has latest firmware.
0.7.2 can download full 750kb screenshot but it takes long time ~ 1 min.

Maybe a terminarion issue in 0.7.2?

Pyvisa-info:

Machine Details:
Platform ID: Linux-6.8.2-arch2-1-x86_64-with-glibc2.39
Processor:

Python:
Implementation: CPython
Executable: /home/arch/test2/.venv/bin/python
Version: 3.11.8
Compiler: GCC 13.2.1 20230801
Architecture: ('x86', 64)
Build: Feb 12 2024 14:50:05 (#main)
Unicode: UCS4

PyVISA Version: 1.14.1

Backends:
ivi:
Version: 1.14.1 (bundled with PyVISA)
Binary library: Not found
py:
Version: 0.7.1
USB INSTR: Available via PyUSB (1.2.1). Backend: libusb1
USB RAW: Available via PyUSB (1.2.1). Backend: libusb1
TCPIP INSTR: Available
Resource discovery:
- VXI-11: partial (psutil not installed)
- hislip: disabled (zeroconf not installed)
TCPIP SOCKET: Available
ASRL INSTR:
Please install PySerial (>=3.0) to use this resource type.
No module named 'serial'
VICP INSTR:
Please install PyVICP to use this resource type.
GPIB INSTR:
Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities.
No module named 'gpib'
GPIB INTFC:
Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of functionalities.
No module named 'gpib'

.
.
.
######## And log file: #########
.
.
.
(.venv) [arch@archlinux test2]$ sudo python ./3-sds-pyvisa.py
2024-04-03 06:45:14,175 - pyvisa - DEBUG - SerialSession was not imported No module named 'serial'.
2024-04-03 06:45:14,223 - pyvisa - DEBUG - USBSession and USBRawSession were correctly imported.
2024-04-03 06:45:14,235 - pyvisa - DEBUG - TCPIPSession was correctly imported.
2024-04-03 06:45:14,237 - pyvisa - DEBUG - GPIBSession was not imported No module named 'gpib'.
2024-04-03 06:45:14,238 - pyvisa - DEBUG - Created library wrapper for py
2024-04-03 06:45:14,239 - pyvisa - DEBUG - Created ResourceManager with session 3509306
2024-04-03 06:45:14,240 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - opening ...
2024-04-03 06:45:14,297 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - is open with session 6351064
2024-04-03 06:45:14,298 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - reading 1048576 bytes (last status <StatusCode.success_max_count_read: 1073676294>)
/home/arch/test2/.venv/lib/python3.11/site-packages/pyvisa_py/protocols/usbtmc.py:115: UserWarning: Unexpected MsgID format. Consider updating the device's firmware. See #20
warnings.warn(
2024-04-03 06:45:14,366 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - reading 1048576 bytes (last status <StatusCode.success_max_count_read: 1073676294>)
2024-04-03 06:45:14,376 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - closing
2024-04-03 06:45:14,377 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - is closed
2024-04-03 06:45:14,377 - pyvisa - DEBUG - Closing ResourceManager (session: 3509306)
(.venv) [arch@archlinux test2]$ sudo python ./3-sds-pyvisa.py
2024-04-03 06:45:33,084 - pyvisa - DEBUG - SerialSession was not imported No module named 'serial'.
2024-04-03 06:45:33,130 - pyvisa - DEBUG - USBSession and USBRawSession were correctly imported.
2024-04-03 06:45:33,142 - pyvisa - DEBUG - TCPIPSession was correctly imported.
2024-04-03 06:45:33,145 - pyvisa - DEBUG - GPIBSession was not imported No module named 'gpib'.
2024-04-03 06:45:33,146 - pyvisa - DEBUG - Created library wrapper for py
2024-04-03 06:45:33,146 - pyvisa - DEBUG - Created ResourceManager with session 2279201
2024-04-03 06:45:33,147 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - opening ...
2024-04-03 06:45:33,169 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - is open with session 7938331
2024-04-03 06:45:33,171 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - reading 1048576 bytes (last status <StatusCode.success_max_count_read: 1073676294>)
/home/arch/test2/.venv/lib/python3.11/site-packages/pyvisa_py/protocols/usbtmc.py:115: UserWarning: Unexpected MsgID format. Consider updating the device's firmware. See #20
warnings.warn(
2024-04-03 06:45:33,185 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - reading 1048576 bytes (last status <StatusCode.success_max_count_read: 1073676294>)
2024-04-03 06:45:33,195 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - closing
2024-04-03 06:45:33,196 - pyvisa - DEBUG - USB0::62701::60986::SDS1EBAQ1R3930::0::INSTR - is closed
2024-04-03 06:45:33,197 - pyvisa - DEBUG - Closing ResourceManager (session: 2279201)
(.venv) [arch@archlinux test2]$

commented

Updated BIOS to latest - but there is the same issue. Maybe I have to change some BIOS settings?