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HDF5 Write Performance Degrades Over Time When Converting from LMDB (~3.7M entries)
I’m experiencing significant slow-downs when converting data from LMDB to HDF5 format. While the conversion starts off quickly, performance degrades substantially partway through the process.
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3
votes
2
answers
2k
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How can I specify architecture specific npm packages in package-lock.json?
I am developing on Windows and have a CI pipeline in a linux container on GitLab. I can build my Angular application on both systems successfully as long as I do not commit the package-lock.json file.
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160
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How to improve random write I/O for LMDB Java
Currently I have an application running on kubernetes with very low memory and using LMDB Java to store records in disk. During boot up time, I load all data into disk, with the following environment ...
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votes
1
answer
810
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Angular "No native build was found" error in new project (Windows, Node.js 20.14.0)
I'm trying to run a new Angular project but encountering the error "No native build was found" when I execute ng serve. I've created a fresh project using npx @angular/cli new admin-angular ...
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185
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lmdb read slow when file amout is a little larger
I installed lmdb from python:
python -m pip install lmdb
Then I write images into it, I have two settings, one is inserting 6800 images, and the other is 10000 images. All the images have size of ...
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1
answer
357
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Is there a way to specify library size when using arcticdb with lmdb?
I am working on a program which use arcticdb with a local instance of lmdb. During this process I want to create multiple libraries based on different types of data. As the size of the data will ...
3
votes
2
answers
7k
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How can I install lmdb module for python
I want to download the python lmdb module, but I constantly encounter this problem.
Patch-ng module is installed.
I also tried Python version 3.12 on older versions.
\`C:\\Users\\WIN10\>pip install ...
1
vote
1
answer
333
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Concurrent Read/Write in LMDB (Lightning.NET) causes BadCommand error
I'm just starting out using LMDB in C# using Lightning.NET and am having an issue where I get a BadCommand error where a read and a write happen concurrently, even if they're not related.
I was able ...
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1
answer
256
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lmdb/cpython.c:26:10: fatal error: Python.h: No such file or directory
[Disclaimer] I need to use same exact version Blender as well as the bundled Python that comes with it for PVNET-Rendering git repo.
Steps to reproduce the error:
1.
root@fae597dbdb79:/home# wget ...
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91
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LMDB: Is there any peformance difference iterating backwards vs forwards?
By default LMDB uses lexicographical order for keys in it's B+ tree. This can be overridden by providing a custom comparison function or by modifiying the stored keys so they sort differently.
Is ...
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1
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3k
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Mysterious error: "cgo argument has Go pointer to unpinned Go pointer"
I'm getting this error and I don't understand what it means even after reading the documentation. Actually I do thought I understood it, but then it doesn't fit the way it is happening for me. There ...
0
votes
1
answer
157
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Conversion to .lmdb format of PNG Images
I ran a python script below to convert my png images to .lmdb files:
import sys
import os
import os.path
import glob
import pickle
import lmdb
import cv2
sys.path.append(os.path.dirname(os.path....
1
vote
1
answer
322
views
Concurrent mmap page faults failing to use NVMe IO queue on Linux?
I have a database-like service that serves queries from an embedded key-value store (LMDB), where the data is 1. orders-of-magnitude larger than main memory; 2. rarely written to/updated (once per ...
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1
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284
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Upload an LMDB file from dropbox into google colab
I want to upload LMDB file from dropbox into storage of google colab with following code
!wget https://www.dropbox.com/sh/..../tr.lmdb?dl=0&lst=
LMDB files uploaded with named by tr.lmdb?dl=0&...
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111
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Can't retreive a string key after insertion from mdbx key value store, after app restarts
I have been playing with mdbx key value store (Upgraded LMDB).
I am able to insert and get value if I run a app. However after rerun the app (commenting insertion code). I am not able to retrive the ...