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pyvisa / pyvisa-py

A pure python PyVISA backend
https://pyvisa-py.readthedocs.io
MIT License
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[COM] Performance issue - slow transfer - USB #422

Open 0xDEADBEEF-ASAP opened 4 months ago

0xDEADBEEF-ASAP commented 4 months ago

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

MatthieuDartiailh commented 3 months ago

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.

0xDEADBEEF-ASAP commented 3 months ago

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:

0xDEADBEEF-ASAP commented 3 months ago

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:

. . . ######## 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 https://github.com/pyvisa/pyvisa-py/issues/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 https://github.com/pyvisa/pyvisa-py/issues/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]$

0xDEADBEEF-ASAP commented 3 months ago

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