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Very, very slow!

Posted: Thu Jul 11, 2019 5:28 pm
by zoltan

I'm looking to replace the soon expiring Draftsight for linux and found QCAD. Downloaded the 64bit linux version and tried it with some project files (DWG).

The problem is that the drawing manipulation is painfully slow, like - the trial expires before zoom in on some drawings. That's on 20M file, smaller ones are a little bit better, but not much.

Running Fedora 29 on Lenovo Thinkpad P51, SSD, i7-7700HQ and 32G RAM. I tried with both graphics cards with no difference in performance. Draftsight can open the file without problems and manipulate it with minimal "sticking"

Attached is a htop when trying to zoom in on 20M file.
qcad_cpu.png (36.94 KiB) Viewed 4354 times
It is not using all the cores on the CPU and some memory is still available. It is just sitting there spinning wheels.

So, should I continue and try to get it working, or it is futile excercise? I need it for reviewing DWG files made by others, not for my own drawings, so I cannot choose the format myself.

br, Zoltan

Code: Select all

[[email protected] ~]# lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              8
On-line CPU(s) list: 0-7
Thread(s) per core:  2
Core(s) per socket:  4
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               158
Model name:          Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
Stepping:            9
CPU MHz:             900.000
CPU max MHz:         3800.0000
CPU min MHz:         800.0000
BogoMIPS:            5616.00
Virtualization:      VT-x
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            6144K
NUMA node0 CPU(s):   0-7
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d

Code: Select all

[[email protected] ~]# uname -a
Linux localhost.localdomain 5.1.16-200.fc29.x86_64 #1 SMP Wed Jul 3 16:03:17 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Re: Very, very slow!

Posted: Thu Jul 11, 2019 5:36 pm
by andrew
Unfortunately, QCAD is not designed for files of that complexity, sorry.

Re: Very, very slow!

Posted: Thu Jul 11, 2019 6:10 pm
by zoltan
Well, this is not a good news :|

Any plans to change that?

Re: Very, very slow!

Posted: Thu Jul 11, 2019 6:21 pm
by andrew
We're working on improving performance, but the type of files you're working with will not be possible to handle in the near future, so you're definitely looking at another solution.

Re: Very, very slow!

Posted: Thu Jul 11, 2019 6:37 pm
by zoltan
Ok, thanks.