ref: 35ff0931afeac236868423ae29a8dde69892f64b
parent: be5e9cb1476400d19ad4eb8f66cb26c92a222aff
author: sirjofri <sirjofri@sirjofri.de>
date: Thu Apr 11 13:41:40 EDT 2024
fixes, text
--- /dev/null
+++ b/slides/glsl.p
@@ -1,0 +1,28 @@
+.PS
+down
+GLSL: box "GLSL" wid 1.5
+arrow
+SPV: box "SPIR-V" wid 1.5
+Thresh: arrow
+Native: box dashed "Native" wid 1.5
+arrow
+GPU: box dashed "GPU" wid 1.5
+
+right
+[
+move .5 right; "high-level shader program" ljust
+] with .w at GLSL.e
+[
+move .5 right; "low-level SPIR-V program" ljust
+] with .w at SPV.e
+[
+move .5 right; "native program" ljust
+] with .w at Native.e
+[
+move .5 right; "execution on GPU" ljust
+] with .w at GPU.e
+
+L: line dashed from Thresh.c - 3, 0 to Thresh.c + 5.5, 0
+"Compiler" ljust above at L.w
+"Driver" ljust below at L.w
+.PE
--- a/slides/mkfile
+++ b/slides/mkfile
@@ -1,4 +1,4 @@
PICS=`{ls *.p}slides.pdf: tmac slides.ms $PICS
- cat tmac slides.ms | pic | troff -ms | lp -dstdout | ps2pdf -g1024x768 -r80x80 >$target
+ cat slides.ms | pic | troff -ms | lp -dstdout | ps2pdf -g1024x768 -r80x80 >$target
--- a/slides/notes.txt
+++ b/slides/notes.txt
@@ -1,0 +1,4 @@
+INTRO
+
+
+WHAT IS A GPU?
\ No newline at end of file
--- a/slides/slides.ms
+++ b/slides/slides.ms
@@ -1,3 +1,4 @@
+.so tmac
.TL
.rs
.sp |3i
@@ -6,12 +7,17 @@
.ce 100
Joel Fridolin Meyer
.CW \s-3joel@sirjofri.de\s0
+.sp 1i
+10th International Workshop on Plan 9
+.br
+\s-3April 12-14 2024\s0
.ce 0
+.
.bp
+.ds LF "IWP9 2024
+.ds CF "GPU Filesystem for Plan 9
+.ds RF "%
.
-.ds CF "GPUFS – Joel Fridolin Meyer
-.ds RF "IWP9 2024
-.
.TL
What is a GPU?
.DS
@@ -19,11 +25,15 @@
.PE
.DE
.IP •
-Separate ``Computer''
+Coprocessor
.IP •
-Single Instruction, Multiple Data
-.bp
+``Separate Computer''
+.IP •
+``Graphics'' Processing Unit
+.IP •
+Single Instruction, Multiple Data (SIMD)
.
+.bp
.TL
Application Architecture
.DS
@@ -31,37 +41,39 @@
.PE
.DE
.IP •
-Resource Abstraction
+Resource Abstraction (Plug and Play)
.IP •
-9P Performance
+9P Performance?
.IP •
Scalability on the application level
-.bp
.
+.bp
.TL
Inspired by Vulkan
+.sp 1i
.IP •
Lowlevel API
.IP •
Abstract and cross-platform
.IP •
-Shaders and Buffers
-.bp
+Shaders and buffers as objects
.
+.bp +0
.TL
Inspired by Vulkan
+.sp 1i
.IP •
Lowlevel API
.IP •
Abstract and cross-platform
.IP •
-Shaders and Buffers
+Shaders and buffers as objects
.DS
.PS <comp.p
.PE
.DE
-.bp
.
+.bp
.TL
Filesystem Interface
.DS
@@ -71,15 +83,28 @@
box "\fB\s+3Work in progress!\s0\fR" wid 4 ht 1.2
.PE
.DE
+.
.bp
+.TL
+Filesystem Interface
+.sp 1i
+.IP •
+Simple to understand
+.IP •
+Generic enough to be portable
+.IP •
+Plug and Play
+.IP •
+GPGPU first (compute shader)
.
+.bp +0
.TL
Filesystem Interface
.sp .5i
.DS
.ft CW
-; echo n b 4 > ctl # object 0, 4 bytes
-; echo n s > ctl # object 1
+; echo n b 4 > ctl # object 0, buffer 4 bytes
+; echo n s > ctl # object 1, shader
; cp buffer.bin 0/buffer
; cp shader.spv 1/shader
.DE
@@ -94,15 +119,80 @@
/1/ctl \fRobject 1 ctl file\f(CW
/1/shader \fRshader program\f(CW
.DE
-.bp
.
+.bp
.TL
Filesystem Interface
-.\" descriptor table
+.sp .5i
+.DS
+.ft CW
+DescPool 0
+ Set 0
+ 0 -1 \fR(unbound)\f(CW
+ 1 0 \fR(Buffer 0)\f(CW
+ 2 -1 \fR(unbound)\f(CW)
+ 3 -1 \fR(unbound)\f(CW)
+ Set 1
+.DE
+.IP •
+Shader is bound to a descriptor pool
+.IP •
+Buffer is bound to a specific binding
+.IP •
+Shader program knows which set+binding to access
+.
.bp
+.TL
+Example Shader Program
+.sp .2i
+.DS
+.ft CW
+#version 450 core
+
+layout(std430, set = 0, binding = 1) buffer pos
+{+ vec4 positions[];
+};
+
+layout(local_size_x = 1000,
+ local_size_y = 1, local_size_z = 1) in;
+
+void main() {+ vec4 position =
+ positions[gl_GlobalInvocationID.x];
+ // do something beautiful
+}
+.DE
.
+.bp
.TL
+Workgroups
+.sp 1i
+.IP •
+Number of workgroups (set by application)
+.IP •
+Workgroup size (compiled in the shader; \f(CWlocal_size_x\fR, …)
+.IP •
+Both are 3D vectors
+.IP •
+#(Invocations) = #(workgroups) · (Workgroup size)
+.
+.bp
+.TL
+Example Shader Program
+.DS
+.PS <glsl.p
+.PE
+.DE
+.IP •
+Lots of magic happens in the driver
+.IP •
+SPIR-V program is cross-platform
+.
+.bp
+.TL
Implementation
+.sp 1i
.IP •
Draft Implementation (CPU)
.IP •
@@ -109,3 +199,16 @@
Drawterm (GPU, Vulkan SDK)
.IP •
Possible others? (SSE/CPU, network, hardware, …)
+.
+.bp
+.LP
+.rs
+.sp |3.5i
+.ce 100
+\s+5\fBThank you\fR\s0
+Questions?
+.ce 0
+.ds LF "
+.ds RF "
+.ds CF "\s-8\f(CWpic slides.ms | troff -ms\fR\s0
+.
\ No newline at end of file
--- a/slides/what.p
+++ b/slides/what.p
@@ -1,7 +1,15 @@
.PS
+down
CPU: box "CPU"
line <->
-GPU: box "GPU"
-arrow from CPU.s down
-box "\s-5Coprocessors\s0" "\s-5(e. g. FPU)\s0" wid 1.5 ht 1.1
+[
+ B: [
+ right
+ box "FPU"
+ box "GPU"
+ box "…"
+ ]
+ box wid 3 ht 1.3 at B
+ "\s-5Coprocessors\s0" above at last box.s
+] with .n at last line.s
.PE