>From 9256445a646099df48b3f6af7ad232dd228f3039 Mon Sep 17 00:00:00 2001
From: Akira Yokosawa <akiyks@xxxxxxxxx>
Date: Tue, 10 Mar 2020 22:12:45 +0900
Subject: [PATCH 2/2] cpu/overheads: Typo fixes and wording improvement
Also flag suspicious raws in Table E.1 as comments.
Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx>
---
Hi Paul,
Think of this as a reminder rather than a patch to be applied as is.
Updated Table E.1 looks inconsistent to me.
Thanks, Akira
--
cpu/overheads.tex | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/cpu/overheads.tex b/cpu/overheads.tex
index d1b4f596..e5ea0803 100644
--- a/cpu/overheads.tex
+++ b/cpu/overheads.tex
@@ -189,7 +189,7 @@ atomic operations on the lock data structure, one for acquisition and
the other for release.
In-core operations involving interactions between the hardware threads
-sharing a single core are about the same cost and same-CPU operations.
+sharing a single core are about the same cost as same-CPU operations.
This should not be too surprising, given that these two hardware threads
also share the full cache hierarchy.
CAS stands for an atomic compare-and-swap operation, where the hardware
@@ -198,9 +198,9 @@ compares the contents of the specified memory location to a specified
in which case the CAS operation is said to have succeeded.
If they compare unequal, the memory location keeps its (unexpected) value,
and the CAS operation is said to have failed.
-The operation is atomic is that the hardware guarantees that the memory
+The operation is atomic in that the hardware guarantees that the memory
location will not be changed between the compare and the store.
-CAS functionality is provided by the x86 \co{lock;cmpxchg} instruction.
+CAS functionality is provided by the \co{lock;cmpxchg} instruction on x86.
In the case of the blind CAS, the software specifies the old value
without looking at the memory location.
@@ -317,15 +317,15 @@ thousand clock cycles.
Clock period & 0.4 & 1.0 \\
Same-CPU CAS & 12.2 & 33.8 \\
Same-CPU lock & 25.6 & 71.2 \\
- Blind CAS & 12.9 & 35.8 \\
- CAS & 7.0 & 19.4 \\
+ Blind CAS & 12.9 & 35.8 \\ % CAS?
+ CAS & 7.0 & 19.4 \\ % Blind CAS?
\midrule
Off-Core & & \\
- Blind CAS & 31.2 & 86.6 \\
+ Blind CAS & 31.2 & 86.6 \\ % Realy Blind?
CAS & 31.2 & 86.5 \\
\midrule
Off-Socket & & \\
- Blind CAS & 92.4 & 256.7 \\
+ Blind CAS & 92.4 & 256.7 \\ % Realy Blind?
CAS & 95.9 & 266.4 \\
\midrule
Off-System & & \\
--
2.17.1
