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Compare speed of two algorithms using big-oh notation

How do you prove the truth of such statements?

All $ \Theta\left ( n^2 \right )$ algorithms are faster than all $ \Theta\left ( n^3 \right )$ algorithms.

An $ O \left ( n^2 \right )$ algorithm will run faster than a $ \Omega\left ( n logn \right )$ algorithm for sufficient large $ n$ .

All $ O \left ( n^3 \right )$ algorithms run slower than all $ O\left ( n^2 \right )$ asymptotically.

I don’t really know what I need to show here..is it just enough to compare the rate of growth between two functions? or has this something to do with the definition of big-oh,omega and theta?

Can someone give me some examples how to do that?

Nginx v1.15.9 slow upload speed with enabled HTTP2

I noticed that uploading speed began slower a bit after enabling HTTP v2 in Nginx v1.15.9.

To enable HTTP v2 support I just added http2 to listen directive:

listen 443 ssl http2; 

Average uploading time of single file of 5MB: – HTTP v2: 31s – HTTP v1.1: 18s

I played around http2_recv_buffer_size but no result.

It does not look like expected behavior. Are there any suggestions to check out?

If file system is dirty, can I safely delete files in .Trashes folder of an external HDD to speed up fsck?

I got a brand new HDD, formatted in exFAT, I was moving folders to it and it happened that something got corrupted when I opened more threads to copy files there.

I know the directory that faulted (it got stucked, maybe for hundred thousands files in it). I tried to remove it (was moved on .Trash folder on mac).

But could not erase files. So I unplugged the HDD, thinking no process was running.


sudo fsck_exfat -q /dev/disk1s2 

reports file system dirty

sudo fsck_exfat -gd /dev/disk1s2 

I see that it goes through the long list of files listed in the ./Thrashes/

folder of the external HDD

I wonder if I could do:

rm -r ./Thrashes/* 

to remove all files in thrash, and run again fsck to make the process faster.

Or is it better to avoid and let fsck complete, since file system is dirty ?

I also occasionally see lines:

Read      offset = 0x000005200000  length = 0x040000 

Does it mean is an error, or simply an information ?

this is the log I got:

sudo fsck_exfat -gd /dev/disk1s2 Opening /dev/rdisk1s2 (S,"Checking volume.",0) (S,"Checking main boot region.",0) 7813556224 total sectors; 512 bytes per sector FAT starts at sector 32768; size 131072 sectors 15260532 clusters starting at sector 163840; 262144 bytes per cluster Root directory starts at cluster 11 Read      offset = 0x000001000000  length = 0x001000 (S,"Checking system files.",0) Read      offset = 0x000005240000  length = 0x040000 (S,"Volume name is %1$  @.",1) luigi4T Found active bitmap; first cluster 2, length 1907567 (S,"Checking upper case translation table.",0) Read      offset = 0x000005200000  length = 0x040000 Found upcase table; starting cluster 10, length 5836 (S,"Checking file system hierarchy.",0) Directory / File      /._.Trashes Directory /.Trashes Directory /.fseventsd Directory /.Spotlight-V100 Directory /.TemporaryItems Directory /20190318 BackUp File      /.com.apple.timemachine.donotpresent File      /._.com.apple.timemachine.donotpresent File      /._.TemporaryItems File      /.apdisk File      /._.apdisk Read      offset = 0x000005280000  length = 0x040000 Directory /.Trashes/501 File      /.Trashes/._501 Read      offset = 0x000005300000  length = 0x040000 File      /.fseventsd/fseventsd-uuid File      /.fseventsd/0000000002073ca7 File      /.fseventsd/0000000002089d5c ... # files I'd like to remove from Thrashes folder, *before* running a files system check again ... File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm2219_9_Assassinio_per_cause_naturali.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm2219_imm_Assassinio_per_cause_naturali.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm221_0_Accordi_sul_palcoscenico.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm221_10_Accordi_sul_palcoscenico.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm221_1_Accordi_sul_palcoscenico.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm221_2_Accordi_sul_palcoscenico.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm221_3_Accordi_sul_palcoscenico.jpg File      /.Trashes/501/WatchDiscovery 10.01.36 AM/backup Jan 21, 2012/Posters_cleaned/mm221_4_Accordi_sul_palcoscenico.jpg 

…. ….

If matters, mac OS version 1.9.5

What is the current computing speed of performing an elliptic curve multiplication?

Hi I was just looking for some information on how long it would take to crack a private key in bitcoin using a brute force approach and I couldn’t find a very good answer for how long it takes to check whether one specific key (or every key) would work.

So essentially what I am asking is how long would the elliptic curve multiplication process take to check whether a single private key would work for a given public key (on average), thanks 🙂

Wifi speed too slow on HP Pavilion All-in-one – Ubuntu 18.10

The wifi speed is too slow on HP Pavilion All-in-One (up to 5 Mbps). The wifi speed on my other devices is up to 100 Mbps.

The specifications of my hardware are:

descrição: Interface sem fio produto: AR9485 Wireless Network Adapter fabricante: Qualcomm Atheros ID físico: 0 informações do barramento: pci@0000:04:00.0 nome lógico: wlp4s0 versão: 01 serial: 5c:c9:d3:52:5c:1e largura: 64 bits clock: 33MHz capacidades: pm msi pciexpress bus_master cap_list rom ethernet physical wireless configuração: broadcast=yes driver=ath9k driverversion=4.18.0-16-generic firmware=N/A ip= latency=0 link=yes multicast=yes wireless=IEEE 802.11 recursos: irq:18 memória:f7900000-f797ffff memória:f7980000-f798ffff

*-network descrição: Ethernet interface produto: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller fabricante: Realtek Semiconductor Co., Ltd. ID físico: 0 informações do barramento: pci@0000:05:00.0 nome lógico: enp5s0 versão: 0c serial: 3c:a8:2a:26:b0:16 tamanho: 10Mbit/s capacidade: 1Gbit/s largura: 64 bits clock: 33MHz capacidades: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuração: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=no multicast=yes port=MII speed=10Mbit/s recursos: irq:19 porta de E/S:d000(tamanho=256) memória:f7800000-f7800fff memória:f2100000-f2103fff

Does number of animals pulling a cart affect the speed they can travel?

To add to my question here about a mule’s pulling capacity, I was curious to know how in-depth additional information should be processed.

For instance, does the 5e RAW or RAI take into consideration how many animals are pulling a vehicle to determine its speed (such as 2 mules carrying the same wagon will have a movement speed boost of 5 feet)? Or is the only advantage to having a second mule an increase in pulling weight from 1,700 lbs. to 3,800 lbs.?

This plain JavaScript plugin anatomy has the terms of speed and undesirable situation error?

I am new to javaScript and even new in the coding world. I’m going to write a plugin. But I don’t know if I’m making mistakes in this plugin anatomy?

I know that to use a object prototype, you need to use the “new” tag. Is it wrong to know? But…

So instead of using the “new” tag outside of the script, is it correct to get into the function?

new myPlugin().show(); its undesirable for us.

instead I have a code diagram as follows.

Does this template contain an anatomy error? (Logically or functionally)

(function(root, factory) {   if (typeof define === 'function' && define.amd) {     define([], factory);   } else if (typeof exports === 'object') {     module.exports = factory();   } else {     var t = factory();     root.bozkit = t.bozkit;     //root.q = t.q;   } })(typeof global !== "undefined" ? global : this.window || this.global, function(root) {     'use strict';    var BOZKIT = {};    BOZKIT.modal = function(h) {    	return new MODAL(h);   }    var MODAL = function(p) {     this.p = p;     this.show = function(){        alert(this.p);     };   }    return {      bozkit: BOZKIT,    }  });  console.log(bozkit.modal("j").show());

In short, is it right to use “new” in a plugin? Or is it necessary to use it out of plugin?

I mean about this: BOZKIT.modal = function(h) { return new MODAL(h); }