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jboner / latency.txt
Last active December 2, 2024 16:39
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
--- mituharu-emacs-mac-b5e5c4a6234d/src/macappkit.m 2017-02-04 13:21:43.000000000 +0800
+++ mituharu-emacs-mac/src/macappkit.m 2017-04-03 14:10:01.000000000 +0800
@@ -1824,6 +1824,18 @@
@implementation EmacsWindow
++ (NSButton *)standardWindowButton:(NSWindowButton)b forStyleMask:(NSWindowStyleMask)styleMask
+{
+
+ NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
--- mituharu-emacs-mac-b5e5c4a6234d/src/macappkit.m 2017-02-04 13:21:43.000000000 +0800
+++ mituharu-emacs-mac/src/macappkit.m 2017-03-31 22:58:41.000000000 +0800
@@ -1824,6 +1824,14 @@
@implementation EmacsWindow
++ (NSButton *)standardWindowButton:(NSWindowButton)b forStyleMask:(NSWindowStyleMask)styleMask
+{
+ if(b == NSWindowDocumentIconButton || b == NSWindowDocumentVersionsButton) {
+ return nil;