Caching techniques

A system comprising:

• one or more processors;
• and
• a memory comprising code stored thereon that, when executed, performs a method of caching comprising:
• determining an update to a first data page of a first cache on a first node, wherein a second node includes a second cache and wherein the second cache includes a copy of the first data page;
• determining, in accordance with one or more criteria, whether to send the update from the first node to the second node;
• responsive to determining, in accordance with the one or more criteria, to send the update, sending the update from the first node to the second node;
• and
• responsive to determining not to send the update, sending an invalidate request from the first node to the second node, wherein the invalidate request instructs the second node to invalidate the copy of the first data page stored in the second cache of the second node.

A computer readable memory comprising code stored thereon that, when executed, performs a method of caching comprising:

• determining an update to a first data page of a first cache on a first node, wherein a second node includes a second cache and wherein the second cache includes a copy of the first data page;
• determining, in accordance with one or more criteria, whether to send the update from the first node to the second node;
• responsive to determining, in accordance with the one or more criteria, to send the update, sending the update from the first node to the second node;
• and
• responsive to determining not to send the update, sending an invalidate request from the first node to the second node, wherein the invalidate request instructs the second node to invalidate the copy of the first data page stored in the second cache of the second node.