From 83868d2968de9809b9485d9cb5f2f1c6b49c6172 Mon Sep 17 00:00:00 2001
From: Per Lindgren <per.lindgren@ltu.se>
Date: Fri, 2 Apr 2021 19:35:27 +0200
Subject: [PATCH] pool benchmark
---
benchmark/README.md | 54 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
create mode 100644 benchmark/README.md
diff --git a/benchmark/README.md b/benchmark/README.md
new file mode 100644
index 0000000..1e3c30a
--- /dev/null
+++ b/benchmark/README.md
@@ -0,0 +1,54 @@
+# Benchmark
+
+Here we focus on the allocation and deallocation.
+
+``` Rust
+mod app {
+ pub const U: usize = 2;
+ pub static P: PoolMan<u32, U> = PoolMan::new([0; U]);
+ ...
+}
+
+use poolman::{Poolman, Box, Error};
+
+#[inline(never)]
+fn just_alloc() -> Result<Box<u32, { app::U }>, Error> {
+ app::P.alloc()
+}
+```
+
+``` arm
+
+08000256 <poolman::just_alloc>:
+ 8000256: b580 push {r7, lr}
+ 8000258: 466f mov r7, sp
+ 800025a: f240 0200 movw r2, #0
+ 800025e: f2c2 0200 movt r2, #8192 ; 0x2000
+ 8000262: f892 1028 ldrb.w r1, [r2, #40] ; 0x28
+ 8000266: b171 cbz r1, 8000286 <poolman::just_alloc+0x30>
+ 8000268: f3ef 8c10 mrs ip, PRIMASK
+ 800026c: b672 cpsid i
+ 800026e: 6a53 ldr r3, [r2, #36] ; 0x24
+ 8000270: f00c 0c01 and.w ip, ip, #1
+ 8000274: eb02 0183 add.w r1, r2, r3, lsl #2
+ 8000278: 69c9 ldr r1, [r1, #28]
+ 800027a: 6251 str r1, [r2, #36] ; 0x24
+ 800027c: 2903 cmp r1, #3
+ 800027e: d305 bcc.n 800028c <poolman::just_alloc+0x36>
+ 8000280: 2201 movs r2, #1
+ 8000282: 7042 strb r2, [r0, #1]
+ 8000284: e007 b.n 8000296 <poolman::just_alloc+0x40>
+ 8000286: 2101 movs r1, #1
+ 8000288: 8001 strh r1, [r0, #0]
+ 800028a: bd80 pop {r7, pc}
+ 800028c: f102 0114 add.w r1, r2, #20
+ 8000290: 2200 movs r2, #0
+ 8000292: e9c0 3101 strd r3, r1, [r0, #4]
+ 8000296: f1bc 0f00 cmp.w ip, #0
+ 800029a: 7002 strb r2, [r0, #0]
+ 800029c: bf18 it ne
+ 800029e: bd80 popne {r7, pc}
+ 80002a0: b662 cpsie i
+ 80002a2: bd80 pop {r7, pc}
+
+```
--
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