Remote Procedure Call (RPC) in Different Kernel Environments
“
Lightweight Remote
Procedure Call
”
Nayan Bhatia
What
is
Remote Procedure Call?
2
•
RPC calls: Cross-machine or Cross-
Domain(micro-kernel)
•
Server provides interface for
procedures/function to the client.
•
Client makes local procedure calls.
•
The local procedure hides the details of the
network communication.
https://web.cs.wpi.edu/~cs4514/b98/week8-rpc/week8-rpc.html
Communication
in
different kernels
M
o
n
o
l
i
t
h
i
c
k
e
r
n
e
l
:
●
Easy communication between kernel threads due to shared address space.
M
i
c
r
o
k
e
r
n
e
l
:
●
Each module in its own “protection domain”, since can only access its own
address space.
●
For communication between these protected domain, RPC is used(Cross
domain RPC).
3
https://documen.site/download/pptx-5acd5f67b613b_pdf
Confusion
W
h
y
c
a
l
l
i
t
“
R
e
m
o
t
e
”
P
r
o
c
e
d
u
r
e
C
a
l
l
f
o
r
t
h
e
s
a
m
e
m
a
c
h
i
n
e
?
●
Same RPC interface for local and remote clients
●
The RPC architecture optimizes under the hood calls to local servers, so that
local clients are not penalized by some remote IPC technique that would be
sub-optimal for local communication (light RPC).
4
https://stackoverflow.com/questions/33272898/what-is-the-point-of-lrpc-why-would-anyone-want-to-make-remote-procedure-calls?noredirect=1&lq=1
Problems
with
RPC in cross-domain
●
RPC systems incur an unnecessarily high cost on the same machine
●
Coalesce weakly related subsystems into the same protection domain,
trading safety for performance
5
Light RPC
6
•
Simple Control Transfer- Request on server’s domain
•
Simple Data Transfer- Eliminate redundant data copy
•
Simple Stub-Simple and fast stub in assembly language
•
LRPC on MP
USE AND PERFORMANCE OF RPC SYSTEMS
●
Frequency of Cross-Machine Activity
●
Parameter Size and Complexity
●
The Performance of Cross-Domain RPC
7
Design and Implementation of LRPC
●
Execution Model
●
Binding
●
Calling
●
Stub Generation
●
LRPC on Multiprocessor (MP)
●
Argument Copying
8
LightRPC Discussion
9
1.
In the world of Unix, are LRPC still relevant today?
2.
How are portals different from LightRPC?
Communication through Remote Procedure Call (RPC) plays a crucial role in facilitating seamless interaction between server and client processes, whether on the same machine or across different kernels. This technology streamlines local and cross-domain communication, optimizing performance while ensuring safety and efficiency in data transfer. Learn about the concepts, challenges, and implementations of RPC in various kernel environments through this comprehensive guide.
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Presentation Transcript
Lightweight Remote Procedure Call Nayan Bhatia
What is Remote Procedure Call? RPC calls: Cross-machine or Cross- Domain(micro-kernel) Server provides interface for procedures/function to the client. Client makes local procedure calls. The local procedure hides the details of the network communication. https://web.cs.wpi.edu/~cs4514/b98/week8-rpc/week8-rpc.html 2
Communication in different kernels Monolithic kernel: Easy communication between kernel threads due to shared address space. Micro kernel: Each module in its own protection domain , since can only access its own address space. For communication between these protected domain, RPC is used(Cross domain RPC). https://documen.site/download/pptx-5acd5f67b613b_pdf 3
Confusion Why call it Remote Procedure Call for the same machine? Same RPC interface for local and remote clients The RPC architecture optimizes under the hood calls to local servers, so that local clients are not penalized by some remote IPC technique that would be sub-optimal for local communication (light RPC). https://stackoverflow.com/questions/33272898/what-is-the-point-of-lrpc-why-would-anyone-want-to-make-remote-procedure-calls?noredirect=1&lq=1 4
Problems with RPC in cross-domain RPC systems incur an unnecessarily high cost on the same machine Coalesce weakly related subsystems into the same protection domain, trading safety for performance 5
Light RPC Simple Control Transfer- Request on server s domain Simple Data Transfer- Eliminate redundant data copy Simple Stub-Simple and fast stub in assembly language LRPC on MP 6
USE AND PERFORMANCE OF RPC SYSTEMS Frequency of Cross-Machine Activity Parameter Size and Complexity The Performance of Cross-Domain RPC 7
Design and Implementation of LRPC Execution Model Binding Calling Stub Generation LRPC on Multiprocessor (MP) Argument Copying 8
LightRPC Discussion 1. In the world of Unix, are LRPC still relevant today? 2. How are portals different from LightRPC? 9
